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IIIBCHANICAL BNGINBBAING PAPER-I

Wluch one of the followmg sets of thermodyn=c laws/!S d1rectly mvolved m detenrurung the final properties dunng an ad!abahc mnnng process? a The first and second laws of

thermodynam1cs b The second law of thermodyn=cs

and steady flowrelahons c Perfect gas relahonslnp and steady

flowrelahons d The first law of thermodynam1cs and

perfect gas rei ah on sh1p The aJr Wlth enthalpy of 100 kJ!kg 1S compressed by an aJr compressor to a pressure and Y temperature at wlnch 1ts enthalpy becomes 200 k.Jikg The loss of heat 1S 40 k.Jikg from the compressor as the atr passes through 11 Neglechng kmehc and potenhal energ1es, the power reqmred for an aJr mass flow of 0 5 k.J/s 1S a 30 kW b 50 kW c 70 kW d 90 kW ConSider the folloWing statements 1 The first law of thermodynam1cs 1S a

!

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Wluch of these statements are correct? a 1 and4 b 1,2and4 c land3 d 2and4 1 0 kg of water 1S heated from 3 00 K to 35 0 K m an msulated tank due to chunung achon by a shrrer The amb1ent temperature 1S 300 K In tlus context, match List I W!th hst II and select the correct answer List I A Enthalpy change B Entropy change I kg C Avadab1hty I kg D Loss of av31lab1hty List II

12 2 kJikg 2 1968kJ 3 2090 kJ 4 656Jikg-K Codes,

b

d

c

'

In wh1ch one of the folloWing S!luahons the entropy change W!ll be negahve? a Alr expands iSothermally from 6 bars

to3bars b Alr 1S compressed to half the volume at

constant pressure c Heat 1S supphed to atr at constant

volume hll the pressure becomes three folds

d Alr expands 1Sentrop1cally from 6 bars to3bars

ConSider the folloWing thermodyn=c relahons

Tds = du + pdv 2 Tds=du-pdv 3 Tds=dh+vdp 4 Tds = dh -vdp Winch of these thermodynamic relahons are correct? a land3

b 1 and4 c 2and3 d 2and4 The head added to a closed system dunng a reverSible pro cess 1S g!Ven by Q = aT + p", where a and ~ are constant The entropy change of the system as 1ts temperature changes from T1 toT, 1S equal Co

a a+,B(T,-T1) b [a+,B(T,-Ij)+,B12(r,'-z;')]11; c [a12+(T,'-z;')+,B13(r,'-z;')]1z;' d aln(T,Ilj)+2a(T,-T1) The mtemal energy of a gas obe)'!ng van der Waals equahon (p+ J )tv-b)=RT depends on 1ts a Temperature b Temperature and pressure c Temperature and sp eafi c volume d Pressure and speafic volume ConSider the folloWing statements A real gas obeys perfect gas law at very 1 h1gh temperatures 2 h1gh pressures 3 low pressures Winch of these statements dare correct? a 1 alone b 1 and3 c 2 alone d 3 alone The Clapeyron equahon Wlth usual notahons 1S g1ven by a (dTidP),.,=h,g!Tvtg b (dPidT),.,=h,g!Tvtg c (dTidP),.,=Th,glvtg d (dPidD,.,=Th,glvtg The capaaty of an a1r compressor 1S speafied as 10 m31mm It means that the compressor 1S capable of a suppl)'!ng 3m3 of compressed a1r per

mmute

b compressmg 3 m3 of free a1r per mmute

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c supplymg 3 m3 of compressed aJr at NTC

d compressmg 3 m3 of standard atr per mmute

A two -stage compressor takes in aJr at 1 1 bars and discharges at 20 bars For ma:nmum effiaency, the mtermediate pressure 1S a 1055bars b 7 33 bars c 55bars d 47bars For the same max:1mum pressure and heat mput, the most efficient cycle 1S a Otto cycle b Diesel cycle c Brayton cycle d Dual combushon cycle ConSider the folloWing statements 1 Octane rahng of gasohne 1S based on

!So-octane and !So-heptane fuels wlnch are paraffin's

2 Tetraethyllead 1S added to gasohne to increase octane number

3 Ethylene dibroffi!de 1S added as scavengmg agent to remove lead depoSits on spark plugs

4 Surface igruhon need not necessanly cause kno ckmg

Wluch of these statements are correct? a 1,2,3and4 b 2,'3and4 c 1 and4 d 1,2and3 ConSider the folloWing statements

Recychng exhaust gases W!th intake increases effi!sS!on of oX!des of mtrogen from the engme

2 When the carburetor throttle 1S suddenly opened, the fuel-aJr m1xture leans out temporanly causmg engme stall

3 The effect of mcrease m alhtude on carburettor 1S to ennch the enhre part-throttle operahon

4 Use of mulhple ventun, system makes it posSible to obtaJn a lngh velocity aJr stream when the fuel!S mtroduced at the maJn ventun throat

Wluch of these statements are correct? a 1and3 b 1and2 c 2and3 d 2and4 Match List I (Alr-fuel raho by mass) W!th List II (Engme opera!! on mode) and select the correct answer List I A >C

' " c " D 12 5 1 List II

CI engme part load 2 SI engmepartload 3 SI engmeidhng 4 CI full load 5 Sifullload Codes,

A C c

b

d ConSider the folloWing statements In down draft carburettor, a hot spot 1S formed at the bottom wall which 1S common for mtake and exhaust marufolds Tiushelpsto 1 improve evaporahon ofhqmd fuel 2 providelngherthermal effiaency 3 reduce fuel consumphon 4 lower the exhaust gas temperature Wluch of these statements are correct? a 1,2and4 b 1,2and3 c 1,3and4 d 2,3and4 In a petrol engme car, which one of the folloWing performance charactenshcs 1S affected by the front- end volatility of the gasohne used? a Hot startmg and vapour lock b Engme warm-up and spark plug

fouhng

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c Spark plug fouhng and hot start:tng d Vapour lock, eng~ne warm-up and

spark plug fouhng In turbo prop, the expans10n of gases takes place approXImately a 100% m the turbme b 80% m the turbme and 20% m the

nozzle c 50% m the turbme and 50% m the

nozzle d 100% m the nozzle The most conunonly used moderator m nuclear power plants 1S a heavy water b concrete and bncks c steel d graph1te Sh1eld!ng m a nuclear reactor 1S generally done to protect agamst a excess electrons b X-rays c a- and ~-rays d neutron and gamma rays Asserl!on (A) If a cube 1S placed m a hqU1d W!th two of 1ts surfaces parallel to the free surface of the hqU1d, then the pressures on the two surfaces wluch are parallel to the free surface, are the same Reason (R) Pascal's law states that when a f!U1d 1S at rest, the pressure at any plane 1S the same 1n all d!rechons a Both A and R are hue and R 1S the

correct explanahon of A b Both A and R are hue but R 1S NOT

the correct explanahon of A c A 1S hue but R 1S false d A 1S false but R 1S hue Asserl!on (A) Catalyhc converters for reduchon of ox1des of rutrogen m engme exhaust catulotbe used W!th leaded fuels Reason (R) Catalyst W!ll be removed due to chem1cal corros10n by lead salts a Both A and R are hue and R 1S the

correct explanahon of A b Both A and R are hue but R 1S NOT

the correct explanahon of A c A 1S hue but R 1S false d A 1S false but R 1S hue

Asserl!on (A) The CI eng~ne 1S baSically more sU1table for supercharg~ng than the SI engme Reason (R) sup erchargmg knockmg

In the CI engme tends to prevent d1esel

a Both A and R are hue and R 1S the correct explanahon of A

b Both A and R are hue but R 1S NOT the correct explanahon of A

c A 1S hue but R 1S false d A!SfalsebutR!Strue Asserl!on (A) W1th the help of a Bomb calonmeter, the lower calonfic value of a sohd or hqU1d fuel can be deternuned, as the water vapour formed 1S earned away by the exhaust gases Reason (R) The lower calonfic value of a fuel!S the net value of heat ava1lable found by subtrachng the latent head of the water formed and earned all{ay by exhaust gas from the lu gher cal onfi c value a Both A and R are hue and R 1S the

correct explanahon of A b Both A and R are hue but R 1S NOT

the correct explanahon of A c A 1S hue but R 1S false d A!SfalsebutR!Strue Asserl!on (A) The thermal effic1ency of Brayton cycle would not necessanly mcrease W!th reheat Reason (R) Constant pressure hnes on the T-s d!agram shghtly d1verge W!th mcrease m entropy a Both A and R are hue and R 1S the

correct explanahon of A b Both A and R are hue but R 1S NOT

the correct explanahon of A c A 1S hue but R 1S false d A!SfalsebutR!Strue Asserl!on (A) A thermodynamic system may be conSidered as a quanhty of working substance W!lh wluch mterachons of heat and work are stud!ed Reason (R) Energy m the form of work and heat are mutually convert1bl e a Both A and R are hue and R 1S the

correct explanahon of A b Both A and R are hue but R 1S NOT

the correct explanahon of A

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c A 1S true but R 1S false d A 1S false but R 1S true Asserl:ton (A) All analyses of heat transfer m turbulent flow must eventually rely on expenmental data Reason (R) The eddy properl:tes vary across the boundary layer and no adequate theory 1S ava~lable to predict thetr behav10ur a Both A and R are true and R 1S the

correct explanahon of A b Both A and R are true but R 1S NOT

the correct explanahon of A c A 1S true but R 1S false d A 1S false but R 1S true Asserl:ton (A) The leakage heat transfer from the outSide surface of a steel pipe canymg hot gases 1S reduced to a greater extent on promdmg refractory bnck luung on the mS!de of the pipe as compared to that W!th bnck hrung on the outS! de Reason (R) The refractory bnck hrung on the mS!de of the pipe offers a higher thermal reSiStance a Both A and R are true and R 1S the

correct explanahon of A b Both A and R are true but R 1S NOT

the correct explanahon of A c A 1S true but R 1S false d A 1S false but R 1S true Asserl:ton (A) Thermal conductance of heat pipe 1S several hundred hmes that of the best ava~lable metal conductor under idenhcal condihons Reason (R) The value of latent heat 1S far greater than that of spea fie heat a Both A and R are true and R 1S the

correct explanahon of A b Both A and R are true but R 1S NOT

the correct explanahon of A c A 1S true but R 1S false d A 1S false but R 1S true Asserl:ton (A) The effiaency of a pump 1S generally less than that of a turbme Reason (R) Although the losses m the two types of machmes are of the same kmd, the losses m pumps are more due to eddies and turbulence

a Both A and R are true and R 1S the correct explanahon of A

b Both A and R are true but R 1S NOT the correct explanahon of A

c A 1S true but R 1S false d A!SfalsebutR!Strue Assert:ton (A) Modem turbmes have veloaty compounding at the ituhal stages and pressure compoundmg m subsequent stages Reason (R) ExcesSive hp leakage occurs m the lngh pressure reg10n of reachon baldmg a Both A and R are true and R 1S the

correct explanahon of A b Both A and R are true but R 1S NOT

the correct explanahon of A c A 1S true but R 1S false d A!SfalsebutR!Strue Assert:ton (A) The a~r-fuel ratio employed magasturbme1Saround60 1 Reason (R) A lean m1xture of 60 1 m a gas turbme 1S ma~nly used for complete combust10n a Both A and R are true and R 1S the

correct explanahon of A b Both A and R are true but R 1S NOT

the correct explanahon of A c A 1S true but R 1S false d A!SfalsebutR!Strue Winch one of the folloWing pus of features and compressors type 1S NOT correct! y matched? a Intake and delivery ports compress10n

" atta~ned by back flow and mtemal compress10n cyhndncal rotor set to eccentnc casmg Vane compressor

b Intenruttent discharge reqmres recetver, produces lngh pressure, slow speed and lubncat10n problems Reciprocahng compressor

c Contmuous flow, radial flow, handles large volume, much higher speed and fitted mto deSign of aero- engmes Centnfugal compressor

d SuccesSive pressure drops through contrachng passages, blades are formed from a number of circular arcs, ax:1al flow

39 ConSider the folloWing statements

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Forced circulahon 1S always used m high pressure power b 01l ers

2 Soot blowers are used for cleamng tube surfaces at regular mtervals

3 Electrostahc preapitator 1S used to remove fly ash from flue gases

Wluch of these statements are correct? a 1,2and3 b 2and3 c 1and3 d 1and2 Once- through boilers operate at a subcnhcal pressure b supercnhcal pressure c subcnhcal as well as supercnhcal

pressure d cnhcal pressure only Match List I (Components) W!th List II (Funchons) and select the correct answer List I A Steam trap B FuSible plug C Blow-offcock D Feed check valve List II

Controls steam flow rate Controls rate of water flow to boiler Puts off furnace fire when water level reaches unsafe hm1 t

4 Removes mud and dut collected at the bottom ofb01ler

5 Drams off water collected by parhal condensat10n of steam m pipes

Codes,

b

d

A

'

Parhal adm1sS1on steam turbine refers to the S1tuat10n where the a steam 1S ad!mtted partially

blades through nozzles b nozzles occupy the

circumference leadmg mto annulus

mto the

complete the blade

c nozzles do not occupy the complete Circumference leadmg mto the blade annulus

d steam 1S adm!tted parhally mto the blades directly

ConSider the folloWing statements regardmg a 1 0 0% react10n h!rbme 1 Change m absolute velocity of steam

across the movmg blades 1S zero 2 Change m absolute velocity of steam

across the momng blades 1S negahve 3 Enthalpy drop m fixed blades 1S zero Winch of these statements" /are correct? a 1 alone b 2 alone c 2and3 d 1and3 Winch one of the folloWing pam 1S NOT correct! y matched? a Internal efficiency of steam turbme

Product of stage efficiency and reheat factor

b Stage efficiency of a turbme Raho of ad!abahc heat drop to the iSentropic heat drop per stage

c Dryness frachon of a steam W!thm a stage Decreases due to reheahng

d Steam condensahon through the h!rbme eros10n

dunng expans10n Enhances blade

ConSider the folloWing statements For supersaturated flow through a steam nozzle, the

enthalpy drop reduces further 2 eX! t temperature mcreases 3 flow rate mcreases Winch of these statements are correct? a 1,2and3 b 1and2 c 2and3 d 1and3 Velocity tnangle for a reachon h!rbme stage 1S shownm the grven figure (AB = v1 =absolute veloaty at rotor blade mlet, CB = W! = relahve velocity at rotor blade mtel, CE = w, = relahve veloaty at rotor balade e:nt and CD= CB)

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' ' " ' ill7 D ~ B g The raho of reach on force to 1m pulse force

" a CE/CB b CD/CE c DEIBD d AEIAB ConSider the folloWing statements 1 Throttle govemmg 1mproves quahty of

steam m the last few stages Internal effic1ency of senously effected govemmg

steam 1S not by throttle

3 Throttle govermng1sbetterthannozzle govemmg

Wluch of these statements are correct? a 1,2and3 b land3 c 2and3 d land2 Wluch one of the followmg statements 1S correct? a Reheat factor 1S zero 1f effic1ency of

the turbme 1S close to umty b Lower the effic1ency, h1gher Will be

the reheat factor c Reheat factor 1S mdependent of steam

cond1hons atturbme mlet d AvaJlab1hty of reheat 1S higher at lower

pressure end In a steam power plant, the raho of the iSentropic heat drop m the pnme mover to the amount of heat supphed per umt mass of steam 1S known as a stage efficiency b degree of reach on c Rankme efficiency d relahve efficiency The cnhcal pressure raho for max:1mum discharge through a nozzle 1S given by

'

b (,: ,)" ,_,

' (";')' d (n~ J~' ConSider the followmg statements The volumetnc effic1ency of a rec1procahng compressor can be enhanced b,

heahng the mtake aJr decreas1ng the clearance volume coohng the 1ntake aJr

Wluch of these statements 1S I are correct? a 1 alone b 1and2 c 2and3 d 3 alone Reciprocahng compressors are promded ~ili a Simple d!Sd plate valve b poppetvalve c spnng-loaded disc valve d solen01d valve ConSider the folloWing statements In centnfugal compressor~ there 1S a tendency of mcreasmg surge when

the number of diffuser vanes " less than the number of impeller vanes

2 the number of diffuser vanes 1S greater than the number of impeller vanes

3 the number of diffuser vanes 1S equal to the number of impeller vanes

4 mass flow" greatly m excess of that corresponding to the deSign mass flow

Wlu ch of these statements dare correct? a 1 and4 b 2 alone c 3and4 d 2and4 In an axial flow compressor deSign, veloaty diagrams are conshucted from the expenmental data of aerof01l cascades Wluch one of the folloWing statements in tln s regard is correct?

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a Incidence angle of the approaclung a1r 1S measured from the tra1hng edge of the blade

b 5 1S the demahon angle between the angle of incidence and tangent to the camberlme

c The deflechon " of the gas stream while passmg through the cascade 1S given by o~a1 -a,

d " 1S the sum of the angle of mcidence and camber less any deviahon angle, ie o~ue-5

The effiaency of a Simple gas turbme can be improved by usmg a regenerator, because the a work of compress10n 1S reduced b heat reqmred to be supphed 1S reduced c work output of the turbme 1S mcreased d heat reJected 1S increased Wluch one of the followmg patrs of formulae represents the specific speeds of turbme and pump respechvely? (Notahons have thetr usual meanmgs) a NQ 112 I H 3A and NP112 H 514 b NQ 112 I H 3A and NP112 H 314 c NPw I H 314 and NQP112 H 514 d NPw I H 514 and NQ 112 H 314 ConSider the followmg turbmes I wheels 1 FranciS turbme 2 PeltonwheelW!thtwoormoreJets 3 Pelton wheel W!th asmgleJet 4 Kaplan turbme The correct sequence of these turbmesl wheels m mcreasmg order of their sp ea fie speeds 1S a 2,3, 1,4 b 3,2, 1,4 c 2,3,4, 1 d 3,2,4, 1 The gross head ava1lable to a hydraulic power plant 1S 1 00 m The uhhzed head m the runner of the hydraulic turbine 1S 72 m If the hydrauhc efficiency of the turbme 1S 90% the pipe fnchon head 1S eshmated to be a 20m b 18m c 16 2m

d 1 8m Match L!St I (Outlet vane angle 3 2) W!th List II (Curves labelled 1, 2 and 3 m the grven figure) for a pump and select the correct answer List I A /3, 90 List II

Q Di>charge

Codes, A

b

d ConSider the regardmg the centnfugal pump

folloWing statements volute cashng of a

1 Loss of heat due to change m veloaty 1S ehmmated

2 Effi aency of the pump 1S mcreased 3 Water from the penphety of the

impeller 1S collected and transm1tted to the dehvety pipe at constant velo a ty

Winch of these statements are correct? a 1,2and3 b land2 c 2and3 d land3 The cavitahons number of any flmd

machmety 1S defined a~ p-,r' (P 1S pVU

absolute pressure, p 1S denSity and V 1S free stream velocity) The symbol p' denotes a stahc pressure of flmd b dyn=c pressure of flmd c vapour pressure offlmd

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d shear stress offlmd ConSider the folloWing statements, A water turbme governor

helps m startmg and shuthng down the turbo umt

2 controls the speed of turbme set to match it With the hydroelectnc system

3 sets the amount of load' wluch a turbine unit has to cany

Wluch of these, statements are correct? a 1,2and3 b 1and2 c 2and3 d 1and3 ConSider the folloWing, statements regardmg a torque converter

Its maX!mum efficiency 1S less than that of the flmd couphng

2 It has two tu!Ulers and a set of stahonary vanes mterposed between them

3 It has two runners 4 The raho of secondary to pnmary

torque 1S zero for the zero value of angular velocity of secondary

Wluch of these statements are correct? a 1and2 b 3and4 c 1 and4 d 2and4 ConSider the folloWing statements The reheat eye! e helps to reduce 1 field consumphon 2 steam flow 3 the condenser S!ze Wluch of these statements are correct? a 1and2 b 1and3 c 2and3 d 1,2and3 The outer surface of a long cyhnder 1S mamtamed at constant temperature The cyhnder does not have any heat source The temperature in the cylmder Will a mcrease lmearly With radms b decrease hnearly With rad!us c bemdependentofrad!us

d VaJY loganthnucally, With radms A compoSite plane walliS made up of two d!fferent matenals of the same thickness and havmg thermal conductnnhes of h and k, respechvely The eqmvalent thermal conduchvity of the slab 1S a ~+k,

b '"

d

k, + k,

"" '"" ,.,

A copper Wire of radms 0 5 mm 1S msulated With a sheatlung of thickness 1 nun havmg a thermal conduchvity of 0 5 W/m -K The outSide surface convechve heat transfer coeffiaent!S 10 Wim'- K If the tluckness of msulahon sheatlung !S' ratsed by 10 nun, then the electncal current-carry1ng capaa ty of the Wire Will a mcrease

b decrease c remam the same d VaJY dependmg upon the electncal

conduchvity of the Wire For the fully developed lanunar flow and heat transfer m a urufonnly heated long arcular tube, if the flow veloaty 1S doubled and the tube d!ameter 1S halved, the' heat transfer co effi aent wdl be a double of the ongmal value b halfofthe ong~nal value c same as before d fourhmesoftheong~nalvalue Heat transfer by rad!ahon between two grey b o d!es of em!SS! mty 1S prop orh onal to (notahons have their usual mearungs)

"

b

d

(E,-J) ( 1 o) (E,-J) (1 o)/o (E,-J) (1 o)' (E,-J) (' ?)

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Solar rad!ahon of 1200 Wim' falls perpend!cularly on a grey opaque surface of enusS!Vily 05 If the surface temperature " 5 ooc and surface enu sS! ve power " 60 0 Wlm', the radioS!Iy of that surface W!ll be a 600 Wlm' b 1000W/m2

d 1200 Wim' 1800 Wim'

The overall heat, transfer coefficient U for a plane compo S1 te wall of n 1 ayers 1S g!Ven by (the tluckness of the i th layer 1S t:, thermal conduchvity of the i th layer 1S k, convective, heat transfer coefficient Is h)

b

d

1 " I 1 -+ L_!_+-~; ,_, k, h,

1 " I 1 -+ L_!_+-

~; ,_, k, h, The equahon of effechveness "= 1 -e-mu of a heat exchanger 1S valid (NTU 1S number of transfer umts) m the case of a boiler and condenser for parallel flow b boiler and condenser for counterflow c boiler and condenser for both parallel

flow and counterflow d gas turbme for both parallel flow and

counterflow Match List I W!th list II and select the correct answer

List I A Fm B Heat exchanger C TranSient conduct10n D Heisler chart List II

UAICmm 2 x/2&

3 .jhplkA 4 hL/ K

Codes,

b

d

D

' '

The Nusselts number 1S related to Reynolds number m lammar and turbulent flows respechvely as a Re -lr.l andRe 02

b RewandRe 08

c Re-wandRe 08

d Re-WandRe- 02

In respect of free convechon over a verhcal flat plate the Nusselt number vanes W!th Grashof number 'Gr' as a Gr and Gr'A for lammar and turbulent

flows respechvely b

d

Gr112 and Gr"' for lanunar turbulent flows resp echvely Gr114 and Gr"' for lanunar turbulent flows resp echvely Gr"' and Gr114 for lanunar turbulent flows resp echvely

ConSider the folloWing condihons for heat transfer (thickness of thermal boundary layer 1S 1\ velocity of boundaty layer iS 1\, and 5 Prandtl number!S P,)

5,(x)=5(x)'f P,=1 2 a,(x)5(x),fP,1 3 a,(x)5(x)lf P,1 Wluch of these condihons apply for convech ve heat transfer? a 1and2 b 2and3 c 1and3 d 1,2and3 The enthalpies at the beg~ruung of compress10n, at the end of compress10n and at the end of condensahon are respechvely 185 kJ!kg, 210 k.Jikg and 85 k.Jikg The COP of the vapour compress10n refn gerahon system 1S a 0 25 b q

c '

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d 1 35 ConSider the followmg statements regardmg refngerants 1 Refngerant NH3 1S used m

reciprocahng compressors 2 Refngerant CO, 1S used m

reciprocahng compressors 3 Refngerant R -llis used in centnfugal

compressors Which of these statements are correct? a land3 b land2 c 2and3 d 1,2and3 The COP of a heat pump /3m and the COP of a refngerator ~IM are related as a ~IIP+~M=l b ~IIP-~IM=l C ~IM-~Hp=l d ~HP+~M=O ConSider the folloWing statements The pressure m a honzontal capillary tube of a refngerahon system decreases due to ilie

fn chonal reSiStance offered by the tube will!

2 accelerahon of refngerant m the tube 3 heat transfer from the tube wall 4 decrease m the potenhal energy Which of these statements are correct? a 1 and4 b 2,3and4 c 1,2and3 d land2 The diScharge pressure of the compressor m the refngerat10n system goes up due to ilie a Lower volumetnc efficiency of the

compressor b Formahon of scale m the condenser c Large S!ze of the condenser d Undercharge oftherefngerant The leakage in a Freon-based refngerahon system can be detected by usmg alan a Oxy-acetylene torch b Halide torch

c Sulphur torch d Blue litmus paper ConSider the followmg statements 1 Azeotropes are the mmtures of

refngerants and behave hke pure substances

2 Isomers refngerants are compounds W!th the same chenucal formula but have different molecular structures

3 The formula n + p + q = 2m I used for unsaturated chlorofluorocarbon compounds (m, n, p and q are the numbers of atoms of carbon, hydrogen, fluonne and chlonne respechvely)

Wluch of the statements are correct? a land3 b 2and3 c land2 d 1,2and3 ConSider the folloWing statements The typical a1r veloahes m the ducts of air-condihorung systems are

lower m reS!denhal bmld!ngs as compared to those of pubhc bmldmgs

2 higher in reS!denhal bmldmg as compared to those of pubhc bmldmgs

3 higher in mdustnal bmldmgs as compared to those of pubhc bmldmgs

4 equal mall types ofbmldmgs Wluch of these statements slare correct? a 1 alone b land3 c 2and3 d 4 alone When warm saturated air 1S cooled a excess moiSture condenses b excess moiSture condenses but relahve

hunudity remains unchanged c excess moiSture condenses and spec!lic

hunudity mcrease but relative humid! ty remains unchanged

d spec!lic hmmdity increases and relahve hmmdity decreases

When d-bulb and wet-bulb temperatures are idenhcal, it means that the a a1r 1S fully saturated and dew-p01nt

temperature has reached b a1r 1S fully saturated

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c dew-pomt temperature has reached and hutllldity 1S 100%

d parl!al pressure of water vapour 1S equal to total pressure

ConSider the folloWing parameters 1 Dty-bulb temperature 2 Hutllld!tyraho 3 Alrvelocity 4 Solar rad!ahon mtenS!ty Wluch of these parameters are taken mto account for detertlllmng effechve temperature for human comfort? a land2 b 1 and4 c 2,3and4 d 1,2and3 The deS!fable a1r velocity m the occupied zone for comfort for summer a!r-cond!honers 1S m the range of a 6 -7 m!tlllnute b 4 - 5 m!tlllnute c 2 - 3 m!tlllnute d 0 5 - 1 5 m/mmute ConSider the folloWing statements 1 The reconunended outSide a1r reqmred

per person for an auditonum 1S approX!mately 0 25 m3/mm

2 OutSide a1r for venhlal!on purposes causes senSible heat load and also latentheatload

3 The senSible heat factor for an aud!tonum 1S generally kept as 0 7

Wluch of these statements are correct? a land2 b 2and3 c land3 d 1,2and3 An a1r-cond!t10ned room of volume 10m3

has mfiltrahon of a1r eqmvalent to 3 a1r changes DenSity of u 1S 1 2 kg/m3, specific heat Cp 1S 1 k.Jikg K and temperature difference between room and ambient a1r 1S 20 K The senSible heat load due to mfiltrated a1r 1S a 60kJ!hr b 12k.Jihr c 6 kW d 0 2 kW

n

If heat and mass transfer take place Simultaneously the raho of heat transfer coeffiaent to the mass transfer coefficient 1S a funchon oftheraho of a Schmidt and Reynolds numbers b Schmidt and Prandtl numbers c Nusselt and LeW!snumbers d Reynolds and Lew:1s numbers An aeroplane travels at 400 kmlhr at sea level where the temperature" 15 C The velo aty of the aeroplane at the same Mach number at an alhtude where a temperature of - 25 oc is preva1hng, would be a 126 78 kmlhr b 1306kmlhr c 371 2 kmlhr d 400 10 kmlhr

Po--t+~--~~

",~J 1

I IPlom Moo:k !

....., The plot for the pressure raho along the length of the convergent -divergent nozzle 1S shown in the given figure The sequence of the flow cond!t10ns labelled dl, m, ~ and 0m the figure 1S respechvely a supersomc, some, subsomc and

supersomc b Some, supersomc subsomc and

supersomc c subsomc, supersomc, some and

subsomc d some, some supersomc and sub some If the full-scale turbine 1S requued to work under a head of 30 m and to run at 428 rpm, then a quarter-scale turbme model tested under ahead of 10 m must run at a 143rpm b 341 rpm c 428rpm d 988rpm The d!mens10nless group formed by wavelength J,., denSity of flmd p, accelerahon due to gramty g and surface tens10n CJ, 1S

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a a!A2gp b a!Ag'p

c ag!A'p

d a!A'ga Wluch one of the standard flows 1S represent the flow cyhnder?

followmg sets of supenmposed to

around a rotahng

a Doublet, vortex and uruform flow b Source, vortex and uruform flow c Smk, vertex and uruform flow d Vertex and un1form flow

A float of cub1cal shape has Sides of 10 em The float valve JUSt touches the valve seat to have a flow area of 0 5 em' as shown m the g1ven figure If the pressure of water m the p1pehne 1S 1 bar, the nse of water level h m the tank to JUSt stop the water flowW!ll be a 7 5 em b 50 em c 2 5cm d 0 5 em

A U- tube manometer 1S cotmected to a p1pehne conveymg water as shownm the g1ven figure The pressure head of water m thep1pehne1S a 7 12m b 6 56 m

c 6 0 m d 5 12m The eye of a tornado has a radius of 40 m If the maX!mum W!nd veloc1ty 1S 50 rrJ~ the velo a ty at a diStance of 80 m radms 1 s a 100 rrJs b 2500 m/s c 3125m/s d 25 m/s If a vessel contammg hqmd moves downward W!th constant accelerat10n g, iliee a the pressure throughout the hqmd mass

1S ahnosphenc b the pressure m the hqmd mass 1S

greater than the hydro stat1c pressure c thereW!llbevacuummthehqmd d the pressure throughout the hqmd mass

1S greater than ahnosphenc Improved streamhmng produces 25% reduchon m the drag coeff!C!ent of a torpedo When 11 1S travehng fully submerged and assummg the dnvmg power to remam the same, the mcrease m speed W!ll be a 10% b 20% c 25% d 30% If a bullet" fired 1n standard a1r at 15 oc at the Mach angle of 30, the veloc1ty of the bullet would be a 5135m/s b 585 5m/s c 645 5m/s d 680 5m/s

103 A stream funchon 1S g1ven by (x'- i'l The potenh al funchon of the flow W!ll be a 2xy + f(x) b 2xy + constant c 2(x'-y") d 2xy + f(y) The he1ght of a cyhndncal conta1ner 1S tw:!ce that of 1ts diameter The raho of the honzontal forces on the wall of the cyhnder when 11 1S completely filled to that when 11 1S half filled W!lh the same hqmd,

"

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omThe veloc1hes and correspondmg flow areas of the branches labelled CD,,~, 0 and m for p1pe system shownm the g!Ven figure are g!Ven m the followmg table

Pip. Lol:l

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'"

'"

'"

/---,-----~' ' / ,.; ,_; __ .------;.,-

{f"l!/1 fTTT7T! 1 fUllll.2D Based on tlus figure, match List I (BoundaJY 1 ayer zones) With List II (Types of boundaty layer) and select the correct answer

List I A c

' Q

c R D

' List II TranS!honal

2 Lammarv!Scous sub-layer 3 Lammar 4 Turbulent Codes,

b

d

c

'

A p1pe of 20 em d!ameter and 30 km length transports od from a tankers to the shore Wlth a veloaty of 0 318 m/s The flow 1S lammar If ~ = 0 1 N - rrJs', the power reqmred for the flow would be a 925kW b 836kW c 763kW d 1013kW In a turbulent boundaty layer over the enhre length of a plate, the boundaty layer tlnckness 1ncreases With 1ts d!stance X from the leadmg edge as a X

112

b x'" c x'" d x'" Separahon of flmd flow 1S caused by a Reduchon of pressure m the duechon

of flow

b Reduchon of the boundaty layer tluckness

c Presence of adverse pressure grad! en! d Presence of favourable pressure

grachent When pressure drag over a body 1S large as compared to the fnchon drag, then the shape of the body 1S that of a An aerof01l b A streamlined body c A two-d!mens10nal body d A bluff body

11 7 A c1rcul ar cylmder of 400 mm d! ameter 1S rotated about 1ts ax!S 1S a stream of water hamng a uruform veloaty of 4 m/s When both the stragnahon pomts comc1de, the hft force expenenced by the cylmder 1S a 160 kN/m b 1005kN/m c 80 kN/m d 402kN/m An automob1le momng at a veloc1ty of 40 km!hr 1 s exp en encmg a wmd reSiStance of 2 kN If the automob1le 1S momng at a veloaty of 50 km!hr, the power requued to over -come the wmd resiStance 1S a 43 4 kW b 3 125kW c 2 5 kW d 27776kW When a cyhnder 1S placed m an 1deal flmd and the flow 1S umfonn, the pressure coeffiaent Cp 1S equal to a 1-sm'e b

d

1-2sm'e 1-4sm'e 1-8sm'e

If the upstream Mach number of a normal shock occur-nng m a1r (k = 1 4) 1S 1 68, then the Mach number after the shock 1S a 0 84 b 0 646 c 0 336 d 0 564

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J.F: ..... (OB.I) !OOU I of 15

I .

2.

3.

4.

5.

MECHANICAL ENGINEERING PAPER-II

Euler's formula can be used for obruining crippli ng load for a M.S. column wrlh hinged ends. Which one of rhc following cundirions for rhc slrndcmo~s rario 1/k ls robe sarisfied? a. 5 < Ilk < 8 b. 9 < 1/k < IS c. Ill < 1/k < 40 d. 1/k S SO

The kinematic chain shown in the above ligure is a structure b. tuechanistt1 wilh one dcgrue of

freedom 4 mechanism with IWO degret-,; of

freedom tl. mechanism with more th>n two

deg~es of freedom A poinr on a I ink connecting a double slider crank wfll trace~ a. srraighr line b. circle c. parabola d. ellipse A whcd is rolling on straight lcveltruok 1Vilh a uni fonn velocity 'v'. The Instantaneous velocity of a poim on the wheel lying at rhe mid-point of a radius

, ,. a. va1ies betw

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10.

II .

12.

)3.

d. 1.00 A mass is suspended al the bonom (>f two

sprin~ in series having stifli1ess I 0 Nlnun and 5Nimm. The equivalent sprin~ slilliless oflhc 1Wu spring is ncnrly a. O.JN/ mm b. 3.3 Nlmm c. 5 N/nun d. 15 Nlmm 'fhe ' 'd ocity ratio in the t>.ase o f compound lrnin of wheel i~ ctjual to

No. oftcelh on fi rst driver a,

No of Ieeth on ht

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determining safe operation of journal beurinl!? a. Oil wcssuru. bc:lring mclul

lempcrolure and bc:lring vibrulion b. Bearing vibmtion. nil pressure nnd

$pee slatemcms are correct'! a. I 3lld 2 b. I. 1 and 4 c. 2. 3 and 4 d. 1.3and1

25. The crilit:ul S(l\.'ed t'r a shuti is uJfel.'ll'cl b) the. a. ditmc~ter und ih~ eccemricity of th~

shaft b. spru1 and tbe eccemrici(y of the ~hall c. dtamet~r and th~ SP'.lll of th~ shall d. span tlf che shu fl

26. Mutch lis l I (Appl icutions) with lisl II (Joini5) :111d selectche oorrect answer :

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1 ist 1 A Roof girder B. Cylinder b~d of an rc engine t:. Piston rod and cross head 0 Soltd shnft und a pinto List II I. Hook s joint 2. Stwewcd joint 3 Cotter joint

~ . Welded j\lnU 5 Riveted jotnt Codes:

A 0 C 0 a. 5 3 1 .\ h .\ 2 3 1 c. 5 2 3 4 d 4 J 5 nte following 11armm:tcr.; aru to he calculated while designing a screw juck 1 Cure diam~ter of screw l . T urque required to rotate the s~'I'I!W 3. Principal stresses

~ . Height of the nut The correct sequence or the calculation of these parameters is a. 1, 2..\.3 b. 1. 2, 3. 4 c. 2. I. ~. 4 d. 2, 1, 4, 3

2N. Consider the following types of strc:ss't IJ aud select tlte oo~ct answer:

31.

List L A. Compoutld train B. Quick retum mech:u1ism C. buctstrrught line motion D. Approximate straight line mouon List II 1. 1-lart mc:chanism 2 Coriolis forw 3. Transmission or motion around bends

and comets 4. won m~chnnism Codes:

A B l' I) 8 . I 2 3 4 b. J 2 I 4 c. 3 4 I 2 d. t 4 ' ~ 2 Match L1st I (kinematic inversion>) witll List II tnppllcatfons) nnd select the corred

answer~ List I

A. ~ B.~

c.~

0.~ Li>t II I. Hand pump

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1. Compressor 3. Whitworth qukk ret11m me

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b. higher tl1an lhe spo.'Cd for mn.ximum production rnte

c. below the speed. fM minimum cns1 d. equ~J to Ole Speed for minim\lm oost

311. 111~ s~qu.:.1ce of mnrltJn!l$ "S 14K 14 S .. on a grinding wbccJ rcpruscnl\-rcspectively n. bond type, strucl\lre. grade. grnin i1.e

'ltld ahr.asive type h nbmsive type, g.-ain size. g1'"de.

strucluN md bond I) pc " bond typo, grad~. atrncture, grain size

and abr.:a.sive lype cl, abrasive t.>1>e , structure, grude. gmiJ1

size and bond type ~9. In lol life tL:llt.. doubling the .:uujng

speed 1'ol iife tO l /S th of I he original. The Taylor' tool lit\: index i45. Which one of l11c following >latemcnts is c.orrectiJ a. }llq flux is ued in gas welding of mild

steel b. Bornx i$ the commonly Wltd Ou.~

co~ting ou 1\dlding electrodes c, Laser he:~m weldins employs a

vocuum chm~er nod lhw. 3voids use of o .

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47

49.

50.

c. 20 degrees before bottom de3d centre

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57.

58.

3. Arc welding ~- Resistnnce welding l'he correct ~equence of Ulese processes 1n increasing order of ~teir w~lding lgulnting. wbcol List U I , Lnlhe 2. Millin,!! mach me '

' Shnper

4 Centre less grinding t'odes:

A B t' 3 2 b. 2 3 4 "-

4 2 3

D 4

d. J 2 4 Consid2. it can bo used for drilling holts at different points in a work piece.

3. It eM be used for V bull joint welding between two poiLtts.

4.. 'llte memory copa.,ity required for iL~ conttol unit is low. \VIticb of tlttsc arc lhe ch3racteri~l i~ J~ociated -with a point to point robot1

:1, 1 3nd 2 b. L3~nd4 c. l . 2 ond 4 d. 2. 3 J.nd 4 Mnlcb Lit 1 (Components used in jigs und

f~xtures) with l.,ist U (Thatr functions) and select the correct ~nswer J..isrl A. Jack pin B. V -locator

59.

60.

61.

C. Bushes D. Ejectors LisliJ

8 of 15

l . To guide the drill bit duting machining 2 l'or easy removal of the work piece

from th" j ig or fL~turc 11ller the machining. opcr:~.tion is oYc.r

3. To locale the creular or samidrc.ular objects in "jig or lh-ture

4. To locate '">rk piee"" whose tlicucnsiQns ;~rc subject to varit~lion~ Cbdes~

A 0 C D 3 4 l 2 b. 3 4 2 c. 4 ~ , I ~ d. 4 3 2 Match LiL I (Scientist) with List II (Researeh woti.:) and select the conlll:l answer; Listl A. Schcw:ut B. Tagucbi C. Erlnng List II 1 L""s fwtclton in qualitv 2. Quening model 3. Zero dcfe~t 4. Control charts Cercontage (If idle time of equipment. '11te trinl study showed that pcrcon!Dgc M idle time would be 20~'' 11te number of random observnbons nec

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4. MfM 62. Rowon Incentive pion is glven by IR

Houri~ rotc, T Acmal lime; wkcn l11r job. T, = Slanda1u time for job T, = Sl11n rcg:udlng plant location and ... pkmt layout: 1. Qualitative factor "llnlysis i o method

of e\Olluating a poteutial location "itl10ut npplyiug quanlibtiw vo lu'2. For sohu1ons of a linear prognamming prnhlcm 1\'ith mixed COMtruinls. ~ig.MIIIOthod can bo. employegronun1llg problem usinJ!. BigM method, when an ortitkial variahlt: lc\'e$ the bn.i.~. l}te oolumn or tbe tifioiol v.riobk CJJn be removed from

~ll suboequent table>. Which of these statements Me corret:t'l ~. I. 2 aod ~ h. I and 2 c. l and 3 d. hnd 3 Arriv ls .tt telephone ~

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70.

71.

72.

(!, 0.429 d. 0,700 Dummy uclivities are used iu 1.1 1aetwork lo a, Facilit~tte computatiot of slacks b. Satisl)- precedence requiremeniS c. Determine project completion time d. Avoid use of resources If earliest stnning time for nn nct ivily is 8 weeks, the Ia! est finish time is 3 7 weeks and the duration time of !he activity is II W'-"!kS, tlten the toial fiORt i equal tl) a. 111 weeks b. 14 weeks c. 56 weeks d. 40 weeks Consider the lllowing llow chat:

The printed value among X, Y md Z by the computer w1 11 be a. Tite highest b. Tite midd le c, The lowest d. Non~ of the above

73. match List I with List II and sele

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78.

79.

80.

a. 4 2 3 h. 3 2 4 c.

""

, 3 d. 3 1 4

II'

1 f i>-L 21. f 1--t

A loaded beam is shown in the above tigure. J'he bo:nding lnomcnl diagmm of the beam is best rl!presenled as a.

b.

c.

1\ vv d.

At a certain section at a distance x~ liom one of lhe suppons of a simply suppoied beam. the intensily or loading. bending moment and shear Ioree are W , . M" and V, respective!~. if ~oe intensit}' of loading is vuryi.ng continuously along 1ho length of the b"am. the invalid rc.Jation is u. Slope Q, - M, ! V, b. v, = d M, / dx c. W, = d2M, I dx' d. W, = dV, I dx Plane s1ress at a poinl in a body is delined hy principal stresse. 3cr andcr. llle ration of the nunnal Slrcss Ill 01 maximum shear stress of Lhe plane 1,)1' mnximwn shear

SlrCS~ is 3. b. 2 c. 3 d. 4 Which 11ne of the following Mohr's circles reproscnts I he stale of pure shear'/ a.

.b.

d.

v .-q: -$- =$:.

II ol 15

R I. l'hc state of plane >tress in a plate Clf I 00 mm Lhickncss is given as u u = I OON l mm' . o., =lOON l mm' Young's modules = 300 N/mm' Poisson's ration = 0.3 The srress developed in lhe direcllon of

~hickness is a. 1.~1'(> b. 9U N/mm1 c. 100 N/mm1 d. 200 Nfmnl

82. CMsid~r lh!! tolli)\Ving IOOIS; I. lligh carbon steel tools 2. I ligh speed stccllol)b 3. Ceramic 10ols 4. Carbide tools Which uf these 100b an: provWcd with negative mke angle'? a. I nnd 2 b. 2 and 3 c. I and 3 d. 3 and 4

83. A rod of lill!terial with E. - 20() ' I o' Ml'a and a = I 0'3 nunfmm"C is tixed at bo01 lhc ends. II is unilonnly heated ~ueh thai U1e increase in lempernturc i.s. 3oc. The stress develuped in ~1e rod is a. 6000 N/nu112 (!ensile) b. 6000 N'/nun2 (compressive) c. 2000 Nfnun1 (teosilel d. 200(J N/nuu1 (compressive)

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84.

85.

86.

87.

88.

1\ circular solid shatl is subjocled lo a b~nding momenl of 400 kN.m and o twisting mom~nt of 300 kN.m. On the basis or lhe max imum principal, stress lheory. the direcl stress is o ~nd ac.cording lo lhe maximum shear stress theory. lhe

sh~ar stress is r. The mtio a /t alL is a. l/5 b. 319 c. 9/5 d. 11 /6

llte two cantikvcrs A and B sho\\11 in the above figure have the same unifQnn crf various all,>y lng ~lemen~S present in clitlerent st~el materials are given below: I. IR% W;4%Cr: 1% V;5%

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A thin cylinder con~lns lluid ol 3 prl:llsure of 500 Ntm'. ~1e Internal di:m\eter of th"

~hell is Q.(i m and the t

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tho r~tio of oungs moduli of respecHve materials. Reason ( R): Th~ ~ompositc unit or U1l~rnltion ol' A h Both A 1md R are ltUc hut R is NO'I'

the cOrl'curroct c.xplimnlion of i\ b. Bnth A ond R nrc ttuc but R i> NOT

the ..:urrect explanali

c.orn:ct e.~plan.1tion of A b. Bolh A and R nre lrue but R is NO'l'

tbt .:orrect expl3nation nf t\ c. ;\ i true but R is flse by co ld working intcrmf

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Reason (R): Vel) high temperature is 11rodueed m th~ tool-dtip interface. a. Both A and Rare true :md R is the

e~rr~et e.xplanatJ

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l a.E.S-(On.JI zt)ll1 I of 17

I MECHANICAL ENGINEERING J

3,

4.

.5.

PAPERI A rectMgul:~r !lll1l or sq~are cross-~ecuou is havlns ots height equal to 111i ce the length ol'any sode at the ba~e If the lank os filled up w1th a hqllid. the ratio or the ootal hydrostatic force on mw 'emcnJ 11'all to ll;at at d1e lM)rtom os a, 2 ,() b. I 5 c. I ,(I d. 05 Oi.fl'erenllnJ pressu111 bead 111easured by mercor) oil dil'fer~ntial rn;UlOmeter (specific gravity of oil is U.?) equh alont 10 a 6\1() mm difference of mercury lerels " ill nearly be a. 7,62 m of oil b 76 2m ofool c 7.34 m o[ oil d.. 8.47 m of oil A block of alullliniwn bni'UllJ tt1rus of 12 kg is suspended. b) n wuo and lo11 ered uutiJ submerged ln1o a laJJk containing oil or relative de.nsily (1.8, Taking the relative delslll of nluminoum as 2 4. 1he lellsion in U1e:1~ire 1vi ll be (lake g = I (I m!s') a. I '2 Ol}tl N b. liOn N c. 12tH.' d 8() N 1\ barge 3() m Ions and J U m '"de has a draf'l of 3 m 11 hoo noanng w101 us sides w. vertical POSI UOil, If its C~lllre or grnlity IS 2.,5 m above the boltom.. Om nearest l'alue of meracemric height is a. 328m b 2.78111 c. 1.71! m a 1.en> A cylfndrieal vessel ha1ing its height equal tO 11$ dinmler 1s tilled wllh liquid nnd mo~ed horizontnlity m an acceleration equ;tl to acceleration due Lo gmvlty TI1e

7

II.

ratio of U1e liqmd tell in the vessel 10 !he liqwd at stark equtlfbrlum condilion is a. 11.2 b. 11.4 c. n.s d. (1,75 The shear stress developed m a lubncanng oil. ofvscosuy 9.8 1 pose. tilled between two parallel pla1es I em pan ru1d mOVIDJt 111lh relative velocity of2 mls is a 211 N/ni b 19.62 Nlln! c. 29 .62. N/n1' d. .I!J N/1.?-The comective ncc-i\r 0 ' f=

'"' iit1 ftJJ b ---+-f:l ,,, "'

iJ11 Clv f!w c. 11 - -tl-+11-

ar eS uf now) 1111h List II (Basic ideal noll'S) and select lhe. C()n'ecl answer

List I A. Flow over astatiooruy ~yllnder B Flo11 over a llalf Rankine body C Fl\lw over a rotating b

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Q,

10,

2 a.

2

4 :1 3

3 ~ 4

1\ glass tub~ wilh u >QO bcntl is up~n ul both tlr~ .mils. II is m;erNd inlll H no" ing stream of oil. S; 0.\10. so !hut one opening

I~ dlrect~d up~tream and the 0~11~r il .lir.:cted upward Oil in~ide lh' lube is 50 111m higher I han lho ,urfacc nr llowrng nil 11re 'elncity mcasnrcll hy the tube ~.

tr~arly. a. 0.89 mls b. O.W m/s c. 1.~0 ml> d 1.90 m!s AI IMatft'ml of a hori7.ontal line, lhC fluid prcssttrc head is 32 em und vcl(.cily hcud is 4 Cth The reductiort in !tn.m al lOcal il>n II is such 1iuu !he prcssurt.' hcud t.lrops t.luwn to zero. The rotio or ''dlociliet< ttllucallunl.l tu thai atlocationJ is

' I a J " 25 c. ' d I.S

-: If

II h1r maximum trnnsmission of pOwer through u pipe Jlne wtlh total heud ll. the head ion due lD friction hr is gtven b) a 0.1 II b. H/3 c 1112 d. 21-1/3

12.. Twn popclincs ol cquul length :md with cJinDlet~cs ol" J 5 em und l 0 cro un: in parallel and connect two reservoirs. rho difference In wruer levels on the reservoirs li 3 m. 1 r 1h" friclion is assumed to be ~qual, th~ rmjo of Ute di~chur~es due tu U1~ htr$er clio pipe Ill th:ll of the smaller dio pipe is. ucurly, a. 3.375 b 2,756 c. 2.25 d. I .~

13

15.

16.

17

j of17 nw critical cJeptlt ora rcct:Jngulur ~har111~1 of width 4.0 m li.lt a dis~harge of 12 m'ls 1>, nearly, a. JOO mm b. 30 mm .:. 0.972 m d 0 674m An op~n channel llow cnctuntcrs a h) draul ic jump as shown fnlht: figure. Tit< lbllowing lluid no,\ l'tmilitiun;, ure

ob~crwd bet\\ ecn A nnd 13 I.

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c. 0.50 liP~ d. 25.0kl'o

18. Th.: velocity disuibwjon in Ute boundnxy lnyer i~ given .1$ ulu,- y/5 . wh"re u i~ the w locit) at n distaQce y from the bnom1lar~ " ' Is the free stream ' 'elocity nnd ri is the boundary layor lhicku~ss nt a s nwubct>j1 witl1 Li~l 0 (Definition " tho: ratio of) !Jnd select the correct on~11er ; List I A, Ro)~Jolds number B. Fmude number C. We bet' number D. lVfuch 1\UJnbe u ll I. luenio force ond e1aslk Ioree 2. Inertia Ioree and ~urface tension to r"" 3. Inertia force and gravity Iince 4 Inertia force and v;,cous furcc

,\ H c D ll. 1 2 3 4 b. ..t 3 2 1 1!, I 3 2 4 d. + 2 3 ) Tht Kire3m funetitm in ;o 2-dionen ionl 001 lield i! given by 'I ' ~ xy. The poWiltial tionchon IS

( -~..-') ll, 2.

b. (.t' y' l 2

1:. :ry d. .. ~ ..... 1;-t Assertion (A)! A convergent-diveQlenl n07.Zie may give sup

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25 J\Jisconcct cltion uf A

c. ,\ i~ true but R in fnbe d. A is fal.c but R is 1n11: AssliOn (A) Effective tempcrnturc. an [nd.,.. of comfort.. ,. dofint:d U1at lemper.tlure l)f ~oturntccl "ir "' \\thich un~ WQulll c..'qlc-ric11~~ 1ht: !3111 f.:eling 111' comfort O$ ~ ito~od iu Ute oclu>l cnvii'Onment. Reason (R) Comfot1 doo'S cnd on hutnidit)' Md air vclod ty. Botll A und R ,..., true ~nd R io the

t~t explonntion of A b. Both A ~nd R ore troe but R ~ NOT

I he correct c;."On (R) ! 1fthd'lllol di!Tusivily ili

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l~mperatvrc di!ltril\utio.n in 1M !low 1vill be: !he same. n. J3olh A uncl R ore true nnd R a the

~.,rrocl C:J>l>lnalic'ln of A lJ. Bolh A 4lld R are true but R is NU'I

the "orrce~ ~liJlllmutllut llf A .:. !< is I rue bUI R Is fnlsc: tl. A is fnl>e but R i~ lnle

;;3, Mserlion (A) ; Nu.s$dl number iS uiWIIY l!n:alcr Utan Unity R "lcm is 55 kJ. Rt:.loc\u (R) Tioe fie!! Ia\\ enc:t g) b~lnc ti1r 11 clffllecJ ystem is (nnlntinn have their u.su;~l mtrmiog),

\E=Q-W, ' Both 1\ md R nre tn1e Jnd R "' the

~orroct c::c:tor (PWR) nucle.1r pOwer plnnl5 11.$" superhe;otcJ ~team. Rcssllli ( R) An increase in the 'uperheat Ol C(lnsbnt J lfCSSUf~ in~C35Cll the eyelc

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41.

42.

h. Roth 1\ untl R uro tl'\ll! but R is N OT the CQrrcut oxplunatiOJl or A

1:, A Is true l)ut R l& lhlo;" tl. A i~ false hut f{ is true A sbip with hu ll length oi' Jl)(l m is tu run with a spectl uf I 0 1n/s. For dyntunk ~imilurity, the velocity ror II I = 25 model o()fth~ ship in u h)wing Ulll~ should"~ IL. 2 mts h. lO tn/s "

20 nils d. 25 mls A ; tandnrd 91.1 V -nutch weir is used hi measure discharge. l'hc: discharge is (.11 For a height H 1 bove the sm and O, is the tliscbnrge lor u height H.: . IC 1 Ul-1 1 ts 4, then Q~/01 is u. 32 b. 16./i c. 16 J . l! 1\ right circuhu cylinder Is filled wit h a liquid upto Its lop level. li is t'Otnted about its vertical axi~ al such a speed that hllll' the li~uld spills out. then the pressure at the pconc.~ J1liser., atr p1't!.hcater. superheater c. air flrcheatcr, ecunurniscr. superheater tl. cconumisor. supcrhcntc.r. air prchcmcr Which one ul' th~ following ~iotenoet~t$ is not curr~c14l In a tluidizcd-bed hniler ll. the cumfnll!tiun lcmrenllurc;, arc

higher thnn those in the conventional boiler..

b. inl\:rior grade ol' coul c:m he used without s lugging problems

c. the tomullion nr N()x i5 less thun fliDt in the conventional lloilers

d. the volumetric heat release rtlles ure higher thnn those in the convention.1l boilers

Match list l with list 11 and select !he co&Te"t II (Figures! I.

D

4 1 4

nntl _sclcl.;l the

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-D 2.

-~ ' ..1,

-CJ ~.

_-"e) s.

-Et J A 13 c 0

p. ~ 4 2 5 b. I 5 3 ~ e. 3 s 2 ~ (L I ~ 3 5

Jn ( 1' )l.') ~ a. - {1,1', - - 1 (n - 1) p1

:5 I. Tht n~w i11 the vunoll'Ss spa~e between the Impeller t~ilS u dil'fuser inlet of u cemritugnl compressor ban be assumed n. free vone~ b. force ~1rlel' c, sQlld f!

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a. RS b S'l c Ill tl uv 5~. Cons1der the followiug sunemenLS

I(Jlardiug 1hc axial flow in a11 nir compr.:ssor I Surging is :t local phenomenon while

~~~~I iog 11fl'ects ah~ t. S m above the mil mce. and aimospher1c pressure is IO.Jm. The pressu

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3. provides increased dcmnnd ofwtJter. Whft:"h of these swtemenls are Ctlrrett7 a I nnc:IJ b. 2and 3 u. I nml2 d. 1, 1aud3

62. If the reciprocatins pump having n 111eehwtical eOiciency of 80% delivem water nt the rate of80 kg/s wid n h ... aJ or JO m. t/1~ broke power of the pump Is a. 19.4198, th~ net head on the turbine would be. nearly a. 310m b. 295m c. 200 Ill d. 150m

64. CoJSider the following statcuems pertaining to a centrifugal pump : I. The mnnomeuic head is tltc head is

developed b)' the pump. 2. The suction pipe has, generally. a

larger diameter as compared to U1c discharge pipe.

J , Tho ~uiltion pi~ b proviJeJ with It foot valve and a strainer.

4. Th dclivc!Y pipe 1s proviucd With a foo1 valve nnd a striliner.

Of these statements t1. I. 2, 3 and 4 are correct b. 1 nnd 111re con~-cl c. 2 nnJ 3 are. correct d. 1 nnd 3 are c..m-ect

65, For a water turbitle. nlllnin at consmnt head and speed. the operatin,. chnracteristic curves in the given figure show thai upto a ce.iain discharge ' 68. Tbe rnnximum uwnbtt or jlilll generally employed in Jln impule turbine without}el Interference i~ a. 4 b. " c. 8 d. 12

69. A lt)dmullc coupling rrnnsmils I kW of po"cr man Input speed l>f20() rpm. '>lith u slip of 2%. If the input is changed to 400 rpm. U1e power transmitted with d1e same sllp is a. 2kW b. lf2 kW c. 4 kW d. 8kW

70. A plane well of thickness 2L hns n unifol1ll volumetric fteat source q'" (Wim3) , 1t is el\'poscd ttl local ambient lemp~ralurc 1. al t>otb lltl> end$ ('~ = = L). The sw:f.te tempera111re T, rf the wall unuer steadY

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stme condition (where b and k have their usual meaning) is given b} a r ~r ... '1' 1

' " b. r=r.

qJ} 2/r

c. I' T.=T. ~

+ "

L' d. r =r +.L_ I J./1;

71. A nat plu\C has thickn~~;;s S em. thcnnal condut!tlvit) I \V/(mK) oon~ective heat transfer coeflicicnts on it~ two 11at face!; 11f IU W/(m2Kl unJ 10 W/(m1K f. 11tc. nHmll heat transfer coenicient lbr ~;Uch n !lot plate is n. 5 Wl(m1KI b. 6.33. W/(m1KI c. 20 W/(ml K) d. 30 W /(m:K)

72. I he eOlciem.l) ura pin lln viU\ lnsUIUted Hris

tanh mi. U.-

Vlrl l 111'1'

b. tanh mL mL mL

c. lllrlh mL

d. (h~ I kP)"' wnh mL

13. 1\ th

75.

111,,ling c, u = ().S uml b ., l),~ lor hcming uml b :

0 .3 l(l r eill> I ing d, a = 0.8 and b = 0.3 for healing, nnd b =

0.4 for cooling For naturul -,tk

' /~ ~ Orushof number b. PrandLI number ll. Ruylcight number d. Grashol' numbcr/(ltcynolds numbcr)l

76. The shape foetor or a hemispherical Qod)' placed un a nat surface "ith rc.\-pCct tn itscll'i~

77,

il~ zcn1 b. li.2S c. 0.5 d. 1.0 Which one of the tbUowing heal e.xchanges is gives parallel stmlghl line pmwm of tomp,rnture di~tribtlllon for bOLh cold und hut lluid'! H. I'Jlmllcl nom

cupucities with un"q11ul heal

b. Coun(cr-Ou\1 capacities

\lith equal hcut

c. Parallel-tlo\\ with eqnal heal CllflDdties d. Countcr-tluw wilh uncquul bent

cupnciLies

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78. In o ~ounter-1low lte.11 ex~ttnger, the hot lluid i cooled from 110 r to 80" C' l>y a cold lluid which. g.cl~ heated lrnm 30" C lu 60" C. LMID for the-hoot cxdtougcr ill " 20"C b. 30"C. c. 50' C \1. 80' ('

79 In u .:.ounter-tlow he.1t c:xchnng.,-, lh~ product M spr llle hoi nod cold .Duid$. lf l\'1T

i~ oqunl tv 0.5, then the clfecHvene;s of the heal e~ch;~nger 1,5 :t l .ll b. I).S

d. 0.2 80. For n ow owr a IJJJL plnlc tl1o

hydrod)'llnmic boundary layer tbklrness t, 0 .~ mm. 111e d1'11amic vilod A4 N ~-m= and 2 ro~ rt:.'lpcctlvely. Tltc view 6tctor F., lJ ... {),75 b. 0,50 e.. 1).25 d. O.UJ ~2. rite worklnl! IC111Jl"1'31Ure in evapqratnr~

and condemlct coilll of a r~l'rig~raloe n! -23 C :md 21' C n:spocliw ly. Tho COP of the refTigeralor is (),8 of lh" mo~um COP. 1~or a power input of I kW, tlte J'l::frig,.lrolion effecl.produco:.J \\ill bo n. 4kW b, 5 kW c.. Sk\V d. 251\W

II ul 11 83. For ~ heat pump working on v~pour

C

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ss.

89.

c. Lltermodyn~mie \V1 bulb tempcrnture of I he air at U1e in lei

d, mean nt ~ulue B. i\Ult>moti~ Cli.pansioo vn lv~ C. Internally eqUAliz-ed thenol"t'llic

eXpansion vohc D. ExternaUy .:quali:l.ed tht:rmosw!k

o~ponsion valve U~t II I. constant d

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b. Sl.'lli rug~in method is U$ed,. when the duet worl; l exremive. tolll l pr9+. Por n a1r-conuilitmed sp:lce. RTif = l(lO kW, R STIP ; 0. 75. VQiumc t1ow nttc ls eqll.'ll to 100 m' 'minule and mdoor design spcc1lic humidil)' 1s. 0.0 I kgr(lrg ol dry air). 'n1e SllC:Citlc. humidily Of Supply air is n. ll.ll Hl b. 0.0075 ~. 0.0(1$ d U.002S

95 For an oir~ndilioning sy~lem. the o\ltdoor and in(IOor de~~tgn dry bulb temperature.. arc 45~ C and 25" C

l'cspccti\ct~ . 1l1c Npace lo be uir-conditiant>d is 20 m 3(l m S m und inliltTatlon Ill estimated to be cme air

~ange. If the density :od srecific beat of lUI' a.rc 1.2 (kj; of dry aw)lm ,mJ l.02 kJ/k (.kg of dt} rur\"C, thon the sensible bent luad due; to in)iltrtiH~ -.. nearly 11 17.2,-HW h. (, 1.2 k\\' " 1224 kW

~~ 20A k\\' ?6. Mntch List I with Lit II auu .o1cct U1c

c]rreC.t 1.1nswor : n1., - mass trnnsfCI coellicicnf, D - ml)let:uln diiJu.~iun cutllicicnl,

1~- ch'llmc!~-ribtic length dimension, k - lherm>l c:noJuct ivity: (I doos it) , ("'.-, -~pecitic-ht::ll Hf C.Urt.'f-t;I.Ot J1f~IH.I11:~ 11 - dynamic \'~COity) T. i51' I .1\_ Schmidt nutlll>et B. TI1crmal dillUsivity C. Lcwi~ n~ml>er D. Sh"''"O'Id nJtrTther List n I k/ tp Ct, D)

91.

13 of 11 2. h11 LID) 3. II t> D + . I. ,,r,

A B r D II. ~ ~ 2 I b 4 ~ I 2 c, 3 4 2 .I 3 4 1 '2 In the upcrJtiu~< M four $hoke di.,el en~inCe co,..,.,.l 01n~ver using the codes given below:

~. I, 2 and .l b. I. 2 and 4 c. 2 ond 3 d. 1 and4

99. }..bleb List L (Pt1fonuauce Pl!tamct''T \ ') with [,ist ll (('urves l~beUecl L 2. 3, 4 and fiHP y[, Y) reg;>rding .a C::J. engme tun const:mt speed and sel~! Ute ~m:cl answer:

Li>ti A. Total f~el eonsumpli

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v

a

11. c.

1.1.

2

B.H.P. f) c :! ~ J 4

~ 2 4 2

0 2 2 3 3

I \1[1 MDich lh~ LUll I "11h Ust II und sclecl corn .. "CI -am;'' or I i51 I A SujlThe pcrccntuge 1 b) volume) uf CDJ m the dry producl~ wos u. ~~ b. 5% c. I I% d. 18'!-o

Hl4. Mmch list 1 (Mall:r~al) wiOt list U (Use ) and sel~ct the correc1 ttnsw~r: Lht l 1\ Grophit~ B rhorium - 233 C Molten Sodium

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IUS.

D, J>Jutunltun-239 l. in ll I. Coolant 2. Modcnuor 3 . f.iSIt l (Name or c"litity) with Li>t lJ ( Definition) and select the cot'rt:ct answer : List l A. Compressibility factQr B. Jnul~ [homson cc,e111cicnl C. ( \ m .. retiJic hent IJ. ISQthcrmal comprcssibilit) Lil II

I. -+.(.~ ), 2. ( alt ) iJT ' J . ( 'T)

i'p

~- (:;;) A (l c IJ

"' 1 I .J 3

h. 4 3 2 c. 2 3 I I d. 4 2 3

lh\1. rrp. a nll " ' denOie rcspeotlvel) !he ponial prcs.surl! of d.l) 1tir nnd thot of water , ;.:1pour in moist air. the: -)-pC"cilk humidil) or a1r ls gh~n by

" -.P.J_ , ,,+ f')tl

b. .&.. p,.

c. 0.62lp-

fl.

d. (t.l>22p, P11 t /1,

I I() Cnnslder the rhase diagram of a certain substnm:C ~ shf.lwn in the: g i' 'cn llgun:-. Mnlch List 1 (l'rucess} whh l.lst II (Cu1-ve!lilln"sl 1lJJd select the ct>rrcct nns,,er ~

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J f

r '

I ...

Lisl I A. Vaporillltion B. Fusion C. Sublimation Lisr ll I. FE 1. EG ' ~- ED

A ll c a. I J 2 b. l 1 3 c. 3 2 I d. 3 I ].

I ll - l'lvmber of componen~ (C) . ph:L.'$ (P) and degrees or freedom(F) 31\! related by Gibbs-phase ule us a, C - P - F= 2 b. F - C - P= :! c. C + F-P ~2 d. P- F- X 2

l I::!. Consitlcrthc followi.ug statemcnrs : I. Availability is the maximum

theoretic~ I " ork. oblllinablc. 2. Clapeyron's equa1ion fo1 dry salutation

is given by

(1'-1' )=r.JT.("-"') , dQ T.

J . A gas can huve an) rempemtun: a1 given pn:;ssurc unlike 11 vapour whh:h has s fixed temperature at a given

pres~ure. 4. Joule lltomson coefficient is- expressed

u.~ fl = [f.\';/(lp]l, Of tbese 1ati;t111Cili;!; a. I. 2 and 3 are tOITL't:t b. I. 3 and 4 are correct a. 2 and 3 are correct d. 1. 2 and 4 are corn:cl

11 3. Match Li~ I with list II and select the correcL answer :

114.

16 o) 17 List I (Cycles opcrMing between fixed tempeoarure limit$) A. Otto cycle B. Diesel cycle C. Cam01 cycle D .. Bra)'lOu cycle Lis t II (C haracleris tlc o>fryde efficiency lll I. '1 depend;. only ~JXIn temperature

limTts ., '1 depends only. on pressure limits 3. 11 depends on VI' I um~ compression

mtio 4. '1 depend~

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.... l.7kW b, 2.94kW il, 3.921.:\\" d.. 4.0kW

llo_ ~ l~tclt L'"' l willa Li.t U and select Ute ~O.rteCt :JruiWOI'! T, ist l A Air st~ndord c:Jlidcorrect .uaswcr: Ust [ (Fucb) A. Seuti-bituminou coal B. Jligb.-..pced diesel oil C. Biogn. b . I. PG t .i~t II (Choracterislks/usages) I, Methane and carbon di:qulred.. 2. Air contain 21% o:..-ygen by weight. 3- 11e llue ga'"'s :&0t11 ~ coal-flfed

funroce contaill around 70"1> nitrog;:n b volum~

4. ln tltc COid~U$ltC!n of liquid rud;_ Uoe nurnl>cr of moles of tlto rcactnrtts,

Of these: otnlCmcnts a. L 2 and 4. at\! cotTCcl b. L 3 11m! ~ are COI"l\."CL c. 1, :; 11nd -hre correct d, I rutd J a.re correct

120, Maldt l, iSt I with l..i

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j t.E.S-{ORJ) lf)Ol I ol 14

I MECHANICAL ENGINEERING J ~-==::::=!

PAPERII A nll"l1 lllcility has to be designed to Jo ull the welding for 3 products: A. B and C. Per umt \\ elding time for each product s 2() s. ~0 s and :50 s respecu vely Daily demand forecast for product A ts 450. for B is 3(>() and for C is 240. A welding line can operate efficiently for 220 minutes a day Number of welding lines required s a. 5 b 4 c. 3 d 2

2. Consider the followmg statements Comrol chart for vanables provides the

3.

I basic 1 ariability ot the quali ty characteristic.

2 COilSJStCOC~ of perfonnance. 3 number of products falling outside the

tolerrutce limits. Which of these statements are correct'! a. 1. 2and3 b land2 c. 2and3 d land3 Nlatch List I wlth List n and select the correct answer. Lis t I (OR le.,hnique) A Branch and Bound tedlmque B. EXpected >:tlue 3pproac-h C SmooUling and Le1ell ing 0 Ex ponential distributlon U st IJ (Model) I. PERT and CPM 2. Integer programmms 3. Queuing theol)

~- Decision theo"

a b, c.

d

A 2 2 3 3

B

4 4

c 4

D 3 3 2 2

~-

6.

Match List I 11 ith List II and s~lect the correc1 ans\\ er : Listl A. Decision m3king under complete

certamty B DecisiOn making under risk c. Decision mal..ing under complete

uncertain!) D. Decision mal.i:ng bllSed on expert

opinion Lis t ll I. Delphi upproach 2 Maxirna.x criterion 3. Transportauoo model 4. Decision tree

A B c D a. J ~ l ~ b. 4 3 2 C, 3 4 2 d ~ 3 l 2 During manufacture of cemenL the handling of limestone is done by a. beU conveyor b. bucket COlli eyor c. o1erllead crane d. fork-lifl crane Constder the tollo" ing statements regnrdjng linear programming: I Du~l of a dual is the primal 2 When two nlinimum mtios of tlte right-

hand side to the coel'ficienl in the key column nre equal. degenemcy rna}

w~e place. 3. When an arti ficial variable leaves tltc

basis, its C

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7. Lale;1 sun rim of 1111 1M) m ('p,\1 " Ill< ._ Yltll 1\'CIITtn."t blllt !)( tlic ~

""" m 'ida.1 dtt Cllmll110;17 Ulllllhr cx.lCllld< .. L I Midi

~ 1..1! ' u an.1 J d 2.311\i~ I~ Wlt~h Me of !he foll~lli combin.'l!illll!

is 111id IN rnld111.114) ''UI~ Gmcr.~l ~ lltiChmc llld sktllcd

l:dxlur h (j,'fllrl Pllrfl'l>t madtmc and

un>ltlkd Ltoo111 c. ~1:1al puljlil!t ll!l & fOIIO\II is a. 1hc di\IQidl a( finished !IJ

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I 1\.

17.

b. 01e movement of in-proces material from $hOp to shop

c. ;outhorising prnduc(ion work order to b" launcbed

tL 01c di.~patt'h of bills and invoice to II"' custom en

lVlatch List l wiU1 List U and select lhu correct answer.

l,i~1 I (Charts) A. Standard process Sheet B. Multiple activity chart C. Ri&hl and len hnnd nperntion chnrt IJ. Sl)\.f(Jch:nt l, ist 11 (Operat ions/Informations) 1. Op..-rntlon involving assembl_y 11ntl

inspection witltouL mDchinc 2... Opa.tjons involving the cumhinntion

of men nnd machines 3. \Vork measurtm\.!nt -4. Basic inJj>ml:ttion li"' routing

Therhligs A B C D

a. 4 3 2 h. 2 4 s c. 3 4 2 d 4 2 l s If CL ;~ the ril~c :mglc t>r the cutting I I, + is the shear 31111le nd V i~ IJ1e cutting velocity. fucn Ute velocity of oltip sltdrng along the $her plllne is given by

J' cos a n.

"''*!- ~~ ) b. flsin a

c-os(- ~~) reo< a ~.

s in( - a )

tL !'sin a

s in( - a) Match t.l" l '' ith List II und select the \!Qrrttt 41\!~\\' l..o"'l': List l (Cuttin g Tools) 1\. Trcpn.n.ing tool B. Side milling cull~r C. Hob cuuer D. Abrasi,e sticks List D (Appltcalions) L f-or surfilce finishing by honing 2 for machining gears

1~.

19.

20.

21.

3, For cutthtg keyw~ys in sho!U 4. For drilling large di>metcr holes

A B C D a. 1 3 2 4 b. ~ ~ 2 ~ l 2 J 4 d. ~ 2 3 Dry and compressed ~ir i< ud os culling fluid for machining a. steel b. aluminium c. cast irun d. bras. For cuttin~ uf brnss with sing.le-puml culling tool on a lathe. lnol should have a. Ncgotivc rllke angle b. pooitive rnk~ ngle c. zero mkc ang le d. zcrn s ide relief :1nglc Power consumption m mct..1J cutting is m>inly due to a. tangential component of the foNe b. longirudinl COI111l0nc>nt nftle forni>m c. Ratchet and P.JWI rnc.:banism d. W J!dLC

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23.

25.

16.

27.

28.

:,l th time of

electric contact with th" eletrode d. intertilce between U1~ two plates being

j oined A.l'c. blow is more common in "- o.c. welding b. d.c. welding with straight pol>rity c. d.c. welding with '"" "electrodes tl. :o.c:.. welding wiU1 bare electrodes l>inuh eJJ'ect iu welding i~ tho rosu U of a. ~pa11Sion of gMes in the are b. eleelrotu>gnetic fcwees "' ci

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38.

39.

40.

~I.

~ Tile billet is inserted into lite cxlru~ion c.hnmber when; it is surrounded b) suill!ble liquid. The billet js e~lnldcd lltrough il1c die by .tping prcssllo'e to !he liquid

Select tha corn;,c1 '3nswer usmg tie codes given below: n. I nnd ~ b I and~ c.. 2 ~od .3 d. 2 ;md ~ lbo spindle speed range in a gcn~1111-purpos~ lalhc i dividcol it~'o tCJl" whkh nppro)limnlely l'ollow u. aritlunetic progression b gcomctrlc progression c, hnnnonic J~rog:res!inn d. logarithmic pfQgre~ion rhe Indexing of lhe llln'et in a ieno.. o.ccelerared b. lrotnsient, Rteady stnle, accelerated c, traruoiont. accclerllted. steady st.1te d. aacelerafed.,

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47.

.Is.

19.

50.

51.

52.

rwo Identical springs laoolled as Q) and Q) arc armngtress of dtc material i~ 2()0 MPn, the 1;1ilurc load is a IOkN b. 20 kN c. JOO kN

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carry a torque of !\I h. The rolio Mit M11 is . 15 16 b. 314 \), 1'2 II 1116

S 1. Which une of the following (>.1irs is correclly match59. rumptlling' ~ r quenched manen.., lic steel is ut)t, ns well in solid state'l 1. Cry~tnl SU'lclure 2 Rollivo size foetor 3. Chetnicnl-ntlinit_y factor 4 . Relative valence f:tctor Select Ute correct answer using the cdes given below:

~. 1. 2 ;tnt! 3 b. 2. 3 and~ c. I lind 4 d. I. 2. 3 arid 4

64. A t~>dy having wc:ight 11r l t\()11 N is dt'OI>PS, 'fltc diameter of shH A i~ twice Ute diam\ller of shafl B and bollt rc made of the same material.. ...-\ssuming bo[b the sha f\s tO I'Oiale at the Ximum power tt-ansmittt d b) J3 t a. the ~a me ll.' Uo~l ol' A u. half of A .:, 118 til of A d. l/4 til of A

66. llte given figure< (all

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om67.

68.

69.

.,_lto-f

I .. IJ; " 1T

" . -- t I i?f >-----1a. The

~tress at point Q in the weh (very cl\$~ tu the nange) is a. indeterminable due to incomplete data b. 60 Ml'a c, 18 MPa d. 12 MPu A close-coiled helical spring is mad~ of 5 mm tHumctcr wire coiled to 50 mm mean dinmeler. Maximum !Oihenr stress in the sprin!!. under ~e action of an a.xial fotce is 20 Nlmm'. The maximum shL'Ilr stress in a spring made of 3 mm diumeter wire coiled to 30 mm meun diameters 1mder the action of the same fot'('c will be nearly a. 20 Nlmm1

b. 33.3 N/mm' c. 55.6 N/mm~ d. 92.6 N/mm1 A h01izontal beam carrying un i ihot beuriog of rudius r. the fricti

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-1. x/6 A B C D

a. 4 I 2 3 b. 2 3 ~ c. 4 J 2 I d. 2 I 4 3

74. ~~1id1 uf th~ followin~; pair> or devices and their litnctions artn A B C D

a. 4 3 2 h 2 J ~ c, 3 4 I 2 d. J 2 4

76. Force required to nccclcrute a cylindrical hod) which rolls without slipping l1n 11 horizontal plano (mass of cyl indrical l>ody is m. mdit.s of the cylindrical surface in contact "ilh plane is r. rod ius of gynniun of body is k and accekrution of the body i< a i> a. m tkl/~ + I ) a b. ( m~~ I ~) . a "- 111~ \1 d ( mk1 1 r "" II. a

77. Consider th~ Jbllowing statemenL> regarding mutlons in machine.~:

79.

80.

4 ur l l Tangemial accclcra!lon is a function of angular w locity and the radial acc.clcrmion is a function of nngula accclcrntion.

2. The resuhnnt acc.elenuion uf a point A with re~pccl to a poi111 ll on a rotating link is l>crpundicular to AB

3 The direct inn of the rdmile velocity of a poont A with respect to a poinl B on o rotating link is perpendicular to AB.

Which f th.:.

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82.

83.

84.

85.

b. OPST c. UR\Vl' cl. ORPT 11lc spigot of a :.: times the penui.siblc tensilc s !J..,ss for tl1c watdal of spigot where x > I. ' 11c joint car.rios .tJI nxiJII load P. Which ooe of the following equations wiJI give the diameter of tl>e spjgot?

a. D= l~ f x- 1 fTt:r, .~

b. D 2~ J'f(Tr .t-

2 ~p .t l c. D =-JT a.,. ~

II 2P .fi0 D-- .~ ; I 11a:

nc scr"'' .md nut in boooching macl!i!ld arc cl>Qngcd from >quro thread 1.0 ACJtle thread. n.c powor retluiremeni of the

~~Wchinc at the ctween lite radii of the base circle and lit~ dcdc111lttm circle.

Wh1ch of th""e statements "'" correct'/ a. I. 2 and 3 b, 2. 3 and~ c. l.:; and 4 d. l, 2>nd 4 A body of mMs on and cad ius of ~)""lion 1:: is to be r"l'laeed by h'o "'"" m1 and m1 loeilted at dlst.-.nces h, and h, from U1c CO of U1c original body. An e

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89 !vlatcb list I with List 11 .1nd sclc~l tho IUlJTeOII tl1 [l'aWio l>n a rough n l>d

who~c unduJuljuns ~.n.n hu as~umcd lu be-~inu

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om97.

98.

99.

base-c.xcited vibrations. ~te determined by the n. m~ss of lhe vehicle stiffite.,s of the

suspension spring, speed of U1e vehicle. wowllnlj!th of tho rougbni:Ss curve

h speed of the vclucle only u. speed of the whide :JJld lhu s tillh""s of

11le sus1>ension spring d. amplitude of the undulntions

Duin~ torsional vibtution of a shaf\, t.hc node is clwocteri7,ed by the n. mnxm1um angular velocity ll. ma.ximum nngul~ displacement c._ m.1.ximum angular ~cceleratioo d. zero :111gulnr cli~plncemcnl l\'lotch List I (Bearing~') wiU1 Lisi U ( .\pplic41tions) and select the correct ;answer : List 1 A. ('ylindrica l roll., 1:1. lh ll-bcaring r Tnper rulling bearing D. Aogulnr contact bnll-boaring List n l. Radial loads 2. M>chinc uecds (rer:oting under stable condllion. Th~ press urc devdoJled in oil1'ilm is p "hen Uoc jouo:n:ol rotates uL N r.p.m~ ~nu: dynamic vi"cos1ty of luhricanl l 11 and encuorine. and journal of diamuter D i f Wh.ieh nne of u,.,

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lilllowing s tatements ~~ correct for the t>earing'l a. / is directly proportiona I to I' and p b. f is directly propootiol11ll 1o f! lllld N c. f is invcnocl~ I""Prtic but R iS hue

Hili. Asscrll(ln (.'\) A slolic.aUy and clynamicolly bulaoc.cd ocod foroe of the yst~m. a. Buth A oncl R ""' true uod R ., the

cun'Cct ex1>lonation of A b. Both A and R aro truo but R is NOT

I he correct explnalinn of,\ " A is true but R is fale d. A is fake hut R i~ lrue

107. ~\sscrtion (A) : Inertia force olways aot. through the ceniToid of the body -..nd is directed opposite to llt occeJe.rntion of Utconttt e~plan;ttion of A b. Both A nd R are tn1e hut R is NOT

ihe corr>t ""Jllanation of A c. A itruc but R is flllse d. A i t'nlsc but R is !rile

Ill Assertion (Al : In a boiler shel l with n\'t l >lrunger tlUJII a lap joint in riveted ~on~trucd~n.

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o. Both A unci R nrc ll\le und R ;,. the correct explanation or A

b. Both A and R ore true but R is NO' I' lhe coni!d cxplomation of A

c:. A is true but R is fal~e cl. A is false hut R is tnoe

112. As~ertion (A) : Di:tmond 100 Is can b~ used til hli h specdo. ReMOn !R) : Diamond too ls haw very 161\ cuctli~.:-icnt of fricliun. a. Both A and R ar~:t lnoe and R is lh~

correct explollllllon of A 1>. BoU1 A and R arc U'U< hut R i3 NOT

the correct explanation of II c. A is lrue bu1 R ts folsc 11. A is J' IMc but R. i> ttuo

113. Assertion (.\) . !lard wh~ols ore chosud for grinding hnrd m

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I u :.s-(oB.J) 2002 I oi lS [c::====M::"'__EC_HANICAL ENGINE_E_RI-:::::.tf:::G=======::=lj

3

PAPER-I Wboc)l or the roii0\\1ng IS(are related tO meJl,Sorc the discharge b~ a rectangular nulch'/

213 Cd.. b .j2i H1 2. 2f3 Cd. b .j2i H'"-3 2/3 Cd b .fli H~12 -1. 213 Cd b .fi H1'' Select the eorrect answer usiug the cQdes gneu belo11 a. land 3 b 2 and3 c. 2 ruono d 4 ~lone Tbe critical value of Re)' tlolds number for transition from lnminar to turbule-nt

bound~ 0 c. du/dr = (I and dpfdx. < 11 d. 'fbe bound a!) layer tbtckness is zero The lnmiJJar boundRI) layer illickness, o at nny pomt .t l'or flo11 0\er a Jlut plate iS ghI!Jt by 0/x =

0.664 a ~Re, b 1 .32~

JRe.

e. 1,75 ~Re,

d. 5.(1 ~

5.

6.

7

Volumetnc ilow mte Q, accelerauoo due to gravtty g. and bead I>J form a dimensionless group. whtch tSgtl'en by

a J~' Q

b. Jiii ()

c. J;;H Q

J ~!/H A hllldel test is to be conducted in a water

lunn~l using a 1: 20 moel or subnuuine. wbich is to tra1 el at a speed of 12 llmlh deep under sea surface. The 11 mer temperature in the lttnnel IS maintnmed. so tl1a1 its li nematics -, iscosity is hal.F that of sea water. At what speed tS the model test lo be conduc-ted to produce usel\rl data ror U1e prototype? a 12 krnlh b 14() kmih c. 24 kmlh d, IZO l..m/h A model Lest rs to be. conducted for an under water srrucrure. 11hich is likely to be e.'posed to strong water currents. The signiJicanl forces are !mown to be dependent on structure geomcuy. fluid l'elocity, fluid densilv and vtscosttv, fluid depth and acceleration due to grn11ty Choose from Ute codes gi1en belo" . which of the follo11' ng numbers must match for the model with tltat of the prototype 1 Mncb nuniber 2, Weber number 3 Fronde number -1-. Reynolds number a 3 alone b I. 2. 3 and -1-c. l !Uld 2

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8.

10.

II.

cL 3 1111d 4 Uurins ub!lonio, udllmtic flow of!:''""" in pipa, b.

d.

A

1 2 2

]) I 2 2 I

c 2 2

D 2 i 2 2

Wltlch of the tollowih sl1llements islare true In '''"" of orw-ditnl!nSional llo\\ of perfect gas through a converging diverging noz.zle'l I, 'I he ~it \'docity i$ nhvay~ IUpenlonic ?. the es.ot velocirr t'.lln be ~ubsonk or

~upenouic 3 If tho flO\\ is isc:ntropic, the .:>.it

velocity "'"'' be sup,unic -t 1f Ute C>.Xist velocity is sup.rsonic, Uou

.Oow musl bet rscnlropic Sdet:urbiuc 3.. l>:.opllln turbine is o mdiol Do11 rc:o~tion

torhinc Wltich 9f Ute ~bo1e statetnenls isla:n: C

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cL 4 16. "llle ma;Umum c.fficienc) 111 tb" c:o~ of

Pelion "he:~; I is fong)c nl' de (lett ion orth~ jet = 180 - r~l

1- co;. p n. 2

l H os P b, 2

cusp ~.

2 1; wsp d.

-1 17 lfl1 i 1l1e bl:lld livatlable lo r hydraulic.

wrbine lhe power ~d~d and di$clrse I'C$pec(iveJy ,,re proponlo.no.l10 o1. Flv' , I1 '11.N''' h Jf'i',H '".H '~ .:. u w\/71'1,ff11

d. Hn,H~~>,H 18. ln Ute pbc1tomo:non of ~villllions. the

chnracteritic Ouid property inl'olved os a. s-urfitce ten~ ion b. \ 'lsco$ily c. Bulk. Dll)dulus of.::lru;tidty d. \ ' opour jlr~~ 130Jtt forwlll'd b. Bend bo~l..wnod c.. Strnight correct sequcuc" of the c"utrifugal pump components through wbio;:h lh" Duid Oows 1s a. Impeller. SuetiQn J>ipe, ii)ot vnlue lind

~lrninor, Delhery pipe b. Pool ulue and :;trainer. ~udion pipe.

Impeller, Delivery pipe c. hnpelld'. Suction pipo. Del ivet')' pip.:.

foot-value !~trainer d. Suction pipe. D1>lh"ry pip~ eonvc:11 r

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1.7

28.

29.

30.

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33. WlUt increase of pressure, the latent heat of stream

~ Remains same b. Increases c. Decreases d. Behaves unpredicL1bly

Jq. Consider the following statements re.gatding th(' thronling pr01.cs.~ of wet s team: I. The steam pressure .and temperature

tlccreusc but cnthnlny r~mai~s constant 2. Th~ steam pressure decreases, the

lCntpr~ture increases but entrop~ remains constant

J. '11e entropy, specific vulu111e, and dryn~s frict11ion jncrenses

4. The entropy lncrenscs btot the vull1mc and drync'Ss fraction dec,cases.

Which of the above smtcmenL~ all! correct? i!. I nncP b. lund) c. I and~ d. 2 and 4

35, Availability function fur11 closed system is expresst!d as: u. ~ ~ u +Pllv - T,s b. ~ ; du P,1dv-Tr1ds c. ~du - p,, tlv-Tuds ll 4t ~ u +110v-To S

36. T ds equation can. be expressed as ~. Tds = C,,ilt+ TfJdt

k

b. 1ii,;"" C,, dt + : dv

Tk ~- nt.~=c w +-

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3.

-The correct sequence of the given four cycles on T-s plane in Figure (I), (2), (3). (4) is a, Rankine. Ouo. Camnt and Diesel b. Rankine. Ono. Diesel and Camot e. OIL Ranktne. Diesel and Camot d. Ou-o. Rankine, Can1pt and Diesel

41. 1ltc main advanrnge of a reheat Kanklnc cyc.le ls "' Reduced moiswre coment in LiP. side

ofrurbine b. h1CJ'ease eiTicieucy '- Reductd load 0 11 condenser d, Reduced load on pump

43. The order or values of th~rmal efficiency of Otto. Diesel and Dloal cycle. when they have equal com~ression rn(io and heat

r~jcoction. is ~ivcn by a. 11, ... > 7] .... , > /)u,.,J b. /}ilfrwl :> Tf(IIMl > T/uw.1

c.. 1ZJJJ.4 > '1~~ > "'''*' d. IJ, ,,, > q...., > 1]_...1

44. In an air-Slandard Diesel cvcle, r is the compression ratio, p is tlo; fuel c~t-oll' rat io an!l y is the adial:>atlc indes (c,/C, ).

3. IJ = I ~ [ J _(P' - I)] rr' (P- 1)

b. [ 1 ,,, '- 1)] 1/ =1- yr'' ' (p- I)

c. ,, = 1 -r-~_J,J - 1J] lrr ' p-l d. IJ=I- [ I _(P"-'- 1)]

yr' (p- l )

o of 15

-15. Stoichiometric 3lr-fucl ratio b) volume for combustion nfmethnnt! in oiris:

46.

a. 15.: 1 b. 17. t6: 1 c. ll.S2: I d. 1058: 1 AutO ignitlon ti me for petrol-air mixwr~ Is minimum when th" rruio Ill' flctuul fuel-air rotio and chemically correct firel-air rorio is a. 0.8 b. 1.0 c. 1.2 d. I .S

-17. Consider lhe lollowing statements regnrdlng.knock rating or Sl engiuefuels: I. I so-octane Is assigned a rrulng of zero-

ottane number 2. nonnal heptane is assigned a roting ol'

lmndreJ octane number 3. !so-octane is assigned a rating o1

hundred octane number 4. Normal hcpttme is a~sign~d a mting, or

zeoo octane number. Which of tlte above s tatements are c.orrect? a. I nnd2 b. land J c. 3and4 d. 4 and I

48. In spark ignitloo cngfue~ knuck.!n~ c w1 be reduced by; a. Increasing the compression ratio l>. Increasing the cooling water

li.!'mpcraturl" c, Retarding the spark adV>\{ICc d. Increasing thl! inlet nir t-emperature

-19, The te.ndency of knocki11g in Cl engine reduce!> by 8. Hig)l self-ignltluro tempermurc pf fuel

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sn.

5L

51.

53.

b. Dccrca$1: i~ jack-et watcr tcmpcrnturc c. Injection of luel just before TDC d. Decrease in itljection pressure Consider the lUll owing. StatementS relevant to the iguitioo sysL 15 WlmK anll 15 W/mK. respectively. Then the .steady ltont Owt ~trough Ute wuU i.~ a. R kW/m~ b. 5 kW/tn1 c. 4 kW/nt2

d. 3kW/ru2 55. A 320 em hi~h vertical pip" ot 150 c wall

tcmpcratttre i~ in a mom 1vith still air at 1oc. Tbi,~ pipe supplies heat at the mteor 8 k\V imo the room air b~ natwal convcct:iun. Asswning lamillltf: tluw. the height of tlw nipe n"eded tu supply I k W "nly is

56.

58.

a. 10 em b. 20 em c. 40 em d. 80 em The avernge Nusselt tUIJllber ill lruuiuat natural conv

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each. By coating one pfotc. its eml!~i\e l$ tcdu~ed to 0.2.5. Tcmpeuturcs remain unch3ngtd. The ne\1 rdlc i>f heot c.\:c!Jange ~bnll become ~ 500 W/1111 1' GOO \\' im: .:.. 700Wim' J" 800\\110: Twu Jon~ Jlnru llcl plolu~ of Saltlc emissive O.S Mb maintained al diffcrCtll IOlf\J>CTfiiUTe.d. 2 3

Mnt.oh List l (Type of )leal transfer) with l. ist II (Governing dimensionles parnrneler) and select Ll1e correct answer: J.i~l I' A, Pl)rei pertaining to brge h.cnt lmnsfer rnl~ using l'io>: L Fins should be ued on the side where

heat tnnste. coefficient i1 su1lltl l . Lon[! and th1o~ lin~ i hould be used 3. !)hurt and tl>in fins should he u.cJ 4. l1termnl conduetivit}' of fin m>lerial

should bd lnrge Which of 111~ abo\'~ ~IDU:monts are .:orn:er/ a. L 2 aud 3 b. I. 2anJ ~ c. 2 .3 ""J 4-d. I, :'1 and4 Using lhemul-el""tri""' l nnalog) in heat lmnsft:r. malcb List l (EI:Lrical qoantiti~~~ with List ll f fhcrmnl qunntiliC!) nnd 8clocl the-corre;:t n"ver: List t A. Vohnge B. Current C. Rc:sisfun~e 0. c~pilcitonce Lisrll 1. 'l'herm~l r~!li~tn.ncc 2. Tlumn~l CDpncity 3. J!cnt now

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65.

()7.

68.

(' I

D 4

b. 4 l 3 2 ~ 2 l 3 4 tL. 4 3 I 2 P10ndtl uuu1her of u llowin!! lluid !.-c~ Lc:r th.1n unity i rnli~otcs (ht hydrl)(lynnlt1ic lwumlary foyer tluc'-'niO

www.examrace.com72,

73

74

75,

a. (,:I );_ h, ( 2 ) ; ,

II + J

' ~ ( "~~ r Q ( II~ I )~ l"or n rcactinn wr~inc "ilh dcgrc~ of reucainn equal 10 "'~"- ( V is lhl\ :~bsolute saenm velocily o1 inlet and a 1s lhc Sf\glc mnde hy it to lhe anngenl on lh~ whcel) lhc cl'licoency is maximum 1111nr 1hc hladc $pci;d 18 cqual1o a /.:nsiA / 2 b. :!I cos a c. I cos~ a d. !' cosO'

Mm~h Li~'l I Wilh LISI IJ ond seiL the correcl unswer Lis t I (Equipmrn t) A. Amicipnwry gear B. Lnb}'rinlh C luvcncd T-naochmcm D. Dcnertttor Lislll (Appliction urc, 'I he ccmrUi.tgal and dll-l\oslon achon d. C'cntrifugnl. And push-pull atrt1on Compar"J tollXial compct-ssttrs ccutri fugal compressors are mor'c sultublt fur

76

n

7H

79

80

"- lligh heod, to" now rm~ b. Low heod. ''"" Oow mti! o, Low bead. b1gb flow rale d. High heod. high llow rutc

11Jutl5

Smiling Qf bludes in 3\ial- OIJW compressor is aha ph~nomenou of a, A or s lrCllm hloclnng the passal!c b. Moti()n of nlr at sonic velocity c Unslead) . periodic and rever.ed ilow d Air s1eom not able to follow the blnde

contour lo 11 reaotioli b,ubin~ the hc111 tlrop is l'ix~d blade is ~ kJ/I(.g uud the IO!nl heat! t.lniJ1 pet ~tngc is 20 kJ/kg, The degree of rcautil"ll is a .. 40% b. 61i.7'o C'. 60% d 25% 'l11e inlet und cxtl ' 'elodly diagrams of o turb(J much inc rOtulor ore shOwn

T he mrbo mnclun~ IS a. A 11 11.-tiru cvoupri!SS\Ir with l1ackward

curved bJj]do:..~ b, II rndiul compressor with bnck\vnrd

C"Urved !>lodes e- A rudiul compri!SSor "itll lbrwurd

~"'.trved )llades J An n.\iul compr~ssor willo lo f\\ntd

curved blades In an axoru How C()lllpr~ssor 11, = cxi1 11ngl~ from saalor p, = Inkt nng,te 10 ro1or ai = illkl angl~ to suuor fJ1 - ouUetMgl~ lrom roaor The COitdilinn 10 hQve 11 50% degree of reaction is 3. a,= {1, b cr,-n, c. cr1 = {J) Md tJ, " a, d cr1 ~a') and !11 ~ f), Bray1on t}'tle with in finite j111er oooling ond rch

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Stidin~ cydc b Ericsson C) de c. OUo cyclll d. All:.inson cy~lc

81. Assertion (A),; l!fficicn~ of Mcrsiblc engine opcrnting bctwcf:n temperntun: lim lis 'I a itnd I z 1~ n-3Xlmum Reason (R): Wlicienej 01 a Mt:r>1bl~ cni!IJ1e i g.n:.>lcr thn lhal of Jot rm."' cniblc engine. .._ Bolb \ ~nd R .re "'"' nd R io du

.:Om:cl 8;l ~ ... IIOI! ( .\); 111c pcrfumJanee of >inq1lcom:et o:-qllo~~:~tinn nr A h. Both A nd R ore true hul R is f';()l

the cumoct c:xplonoloon uf A c. A is tru~ but R 1S folso: d. A i~ false but lU$ l'n '""

llu. "-'s~rlloo (A): II t< not possble to d~'tomnino 1:2, ITO in -'

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89

'XI.

91

!J2.

Assertion (A): COP t.>fhe.r pump ill mQfc rhnn lhe C'OP e>fits refrigeratorver.;ion. Reusnn 1~): Pumping of ht:tl :ellon turbine is low Rcn.oll (H): Pelton turbine works under a high he10d 11nd han(lles 1011 ilischarge. " Roth t\ and R ore 1rue and R i~ lhc

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b. J'Juorfne atoms from rcftigcrant by L'V rallialion ~nd ..:action 'ith ozan In lrOIII'"phore

.:.. r hlurinc aU!m$ from reJiig~.,.n l l>y I v J'l1diatiou and J'..,.cfion with ozon~ In ~11'111~~ph""'

d. F luo1ino atoms from refrigerant by lJV 1'3d_i:nion 3Jtd rlj!ac-tiQrt wlth ozqne In straU>spbere

98. t- la.~umun poosible COP of .. rolar :.bsorplion rcfiigernJion system wiUt gtneutor (.:mperntun: of 36() K. obsorber temperatura of ~00 1-. condenser letllflCtaturo of .300 K and ewporotof teri1peruturc of270 K i$ n. Q b. 6 C-, ...,

d. 1..5 9'J. ln """~ A. moist air b adfabail . .:.-.11)

$3turJtcd and in case B. mol.st air is iobaric nllv atoroted. The sni\Jrnlion temperatrm:i in "iiS~ A and B ar;, I()M m1'min ltml rresh :.ir flQw rte i~ m' 1min. rnQIIJ s

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11}(1,

107.

lOS

I OIJ.

b. c. d.

l J I

4 ~ 2

3 l 3

rhe llllpillllf) tise bJ 20"(.' ill olean gillS!; tu~ or I mm diameter containing 11 m~r Is appr'o~;motcly a. 15 nun h. 50 mm c. 20 lnlll d Jtl11tm Pres>ure drop ol' ll'lll~r llowin~ throuith u 11ip.: (dtn_~it) 1000 k~(ln1) l)ctwccn twn pomts tS mcasllflld by usi11g u vertitlll U-tub~ mnnomet~r Manometer uses a lfquld >~ith densit)' 200() kg/m1 Th~ difTc"'TlCC fn height of man metric Hquid in the two limbs of tbc maoomctc~ is observed to be I 0 em the pr~ssu.re drop bel ween the two pomls ts: n, 98.1 l'lillll b 9~ I Ntm' c I W>2 Nltttl d. 19620 N/m~ Match l.lst I "ith Ltst lJ aod sd cct the correct unswcr. Lbl I (Stubility) A Smblc equillbnum of u tloating body U. Stnblc cquilibnum ut' u submerg_ctl

body C Unstuble equdibriwn of u Doming

body 0 \Jnstnblc l.>quilibri~m or a submerged

blld)' Li~l U (Cuatll tlons) I Ccmr~> or buoyancy bclo11 tlt~ ccnl-re

ofgr!Mty 2. M~t centre above !he .:entr~ of Jlffi\ it}' J . Ccntill of'buoxrucy abol'c the centre of

gr.lVt\) -1 Met cent re below the cemre t>f &11lvity

A B C D lL 4 3 2 b 1 3 ~ c. 4 2 3 d. 2 4 3 A dam tS havmg n cur.cd surfrtce ll.~ shown to the figure,

I I()

Ill

112

t J ol 15