engine questions

8/13/2019 Engine Questions

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4. Combustion chamber types:

a. Can 0ultiple chambers.

b. Can Annular or turbo annular'combustors.

c. Annular.

5. Divisions of combustion chamber air:

a. 0i+in ,one.

b. Combustion ,one.

c. Dilution ,one has a dilution holes to cool flame head.

. Combustion chamber components:

a. 23irl 4ane.

b. Dilution holes.

c. Fuel no,,les.

d. (iners.

!. The parts of the "#o$ enter Turbofan:

a. Primar" Air Flo3 57 of Total Air8i. Primar" mi+es 3ith the fuel for combustion purposes.

ii. 2econdar" metered into the combustion chamber to complete combustion.

iii. Territor" $t is metered to3ards the outlet end of the combustion chamber to coolthe hot ases.

b. !"'Pass flo3 97 of total Air.

%. &etho's (f )ecuring *otor +#a'es:

a. 21($D R11T -:ith retainin pin and lockin rins/.

b. F$R TR2* R11T -:ith lockin plate/.

a. D1&*TA$( R11T -:ith lockin blade and scre3/.

,. The main types of bearing :

a. !all Radial and a+ial loads.b. Roller Radial loads.

c. Tapered roller accept radial loads and a+ial loads in one Direction.

i. (AR%* TAP*R ; (AR%* A


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ii. 20A(( TAP*R ; (AR%* RAD$A( T#R=2T F1RC*.

d. )eedle roller loads are purel" radial locations 3ill be the end of a control shaft oruni4ersal couplin.

e. Anular contact.

a. Fluid damped dampen out d"namic loads and 4ibration.b. Plain>!ushins.

1-. +earings #ocation on Engine )haft:

a. )1. ?

!earin

.

b. )1. 5

!earin

.c. )1. @

!earin

.

d. )1.

!earin

.

e. )1.

!earin

.

11. Compressor )urge /compressor sta##0:a. $tBs a phenomenon happened if all compressor blades are stalled.b. $f there is a decrease in 4elocit" 3ithout a compensatin chane in rpm blades anle of

attack 3ill increase 3hich leads to stall.

12. Types (f )urge:

a. (o3 speed.

b. 14er fuellin.


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c. 2=R%* $)D$CAT$1)2

13. The visib#e an' au'ib#e in'ications of surging are:

a. *nine 4ibration.

b. Rpm falls off.a. #ih T%T or PT.

b. !anin and>or rumblin from the compressor.14. hat can be 'one to contro# surge

a. The e+cessi4e pressure in a compressor can be relie4ed b" compressor bleed 4al4es

!leed 4al4es are fitted to eliminate lo3 speed compressor sure and allo3 smooth

acceleration b" release e+cess 4olume of air to atmosphere.b. 1r the use of 4ariable 4anes These 4anes are located prior to the first stae rotor and

the" are automaticall" adjusted to redirect the airflo3 into the compressor as the

compressor speed falls off. Thus the air continues to meet the first stae rotors at the

correct anle of attack.c. At hih mach numbers there is an e+cess of intake air and this additional 4olume of air

could choke the compressor so the 4elocit" of the air must be slo3ed do3n. This is done

b" another method of sure control kno3n as intake eometr" control.

15. ccessory ear +o:

a. $nput shaft connected to the compressor shaft at )5 2tae.

b. $t has on it 2tarter enerator.c. C2D Constant 2peed Dri4er o4erns the output speed to the enerator.

1. hats meaning +y Engine ash an' $hy $e use it$tBs a method to clean enine parts especiall" compressor !lades from 3aste and salt to impro4e

its performance.

1!. hat is a +orescopeA borescope is an optical de4ice consistin of a riid or fle+ible tube 3ith an e"epieceon one end an

objecti4e lenson the other linked toether b" a rela"optical s"stem in bet3een. The optical s"stem is

usuall" surrounded b" optical fibers used for illumination of the remote object and a riid or fle+ible

protecti4e outer sheath. The remote object is illuminated and an internal imae formed b" the objecti4e

lens is rela"ed to the e"epiece 3hich manifies the internal imae and presents it to the 4ie3ers e"e.

1%. hy e 6se+orescope in Engine

a. $tBs used for inspection 3ork 3here the area to be inspected is inaccessible b" other

means e+ample8

i. 2tae ? #PT !lades

ii. 2tae 5 #PT !lades.
http://en.wikipedia.org/wiki/Eyepiecehttp://en.wikipedia.org/wiki/Objective_lenshttp://en.wikipedia.org/wiki/Objective_lenshttp://en.wikipedia.org/wiki/Relayhttp://en.wikipedia.org/wiki/Relayhttp://en.wikipedia.org/wiki/Objective_lenshttp://en.wikipedia.org/wiki/Relayhttp://en.wikipedia.org/wiki/Eyepiece


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iii. )o !earin 2ca4ene Tube and #eatshield.

i4. (PT.

4. Combustion Chamber.

1,. Engine Trimming:

a. *nines are trimmed that is adjusted to ensure that take off thrust can be achie4ed under

all operatin conditions.

b. The t3o main factors that o4ern enine trimmin are temperature and pressure.c. Trimmin charts 3ill be found in 0aintenance 0anuals detailin all trimmin

adjustments to be carried out under all 4ar"in conditions of temperature and pressure.

2-. Engine "ue# )ystem:

a. Fuel is used in the enine for po3er as a primar" function of the fuel.

b. Fuel is used in the enine h"draulic s"stem as a 3orkin fluid because itBs a4ailable in

pressure from ?EEE?5EE psi. $tBs used to operate &P& &2&.1c. Fuel is used to cool enine oil.

21. EEC /e#ectronic engine contro#0:

a. $t can take about E input parameters.

b. $t 3orks instead of FC= in modern A>C if CDP5fails **C depends on other parameters

to Control fuel amount.

22. )tarting:

a. T3o separate s"stems are reGuired to start a turbine enine a means to rotate the

compressor>turbine assembl" and a method of initin the air>fuel mi+ture in the

combustion chamber.b. 2tart AP= 23itch 1) position.

c. AP= startin motor *lectric motor bein rotate the AP=.d. At 97 to ?E7 Fuel 4al4e opens but $nition starts before operatin the fuel 4al4e.

e. At E7 AP= starter drops out.

f. At HE7 $%& start to open and at ?EE7 $%& 3ill full" open.. At I7 $nition 2"stem turned off.

h. (oad liht turned 1) *lectric and Pneumatic po3ers are a4ailable.

i. AP= can start usin Aircraft batteries at altitudes up to @EEEE feetJ it can use $D% or an"

other enerator at an" Altitude.j. Pneumatic air can be taken from AP= at altitudes up to 5EEEE feet not more. !ut electric

po3er enabled at an" altitudes.k. -AP= %round Cart or other enine/@suppl" a starter throuh a start 4al4e b" reGuired

pneumatic po3er.

l. $nition 2ub 2"stem -$nition bo+ ??& AC K 2park initer/.

m. Pneumatic 2"stem Dri4e *nine #P rotor.

1. Airframe hydraulic system is not Engine Hydraulic system.2.Compressor discharge Pressure its used to adjust proper amount of F/A ratio.. !tarting Air !ources "AP#$ %round supply truc&$ Engine compressor tapping'.


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n. Pneumatic 2"stem consists of start 4al4e and starter.

o. *C= opens the start 4al4e and $nition bo+ is eneri,ed 3hen #P rotor speed is nominal.p. Fuel injected and burnin starts.

G. :hen enine reach 2elf'2ustainin speed LAD separate starter motor from enine and no

more need to AP= or other e+ternal po3er sources.

23. )e#f7)ustaining )pee':This is the speed at 3hich the ener" de4eloped b" the enine is sufficient to pro4ide forcontinuous operation of the enine 3ithout the startin de4ice.

24. )tarting types:

a. #un start'' rpm is slo3 or fails to reach $D(* rpm.

b. :et start '' hih *%T and Torchin.

c. #ot start '' Alert T%T e+ceeded lo3 supplier *(*C or Air.

a. Aborti4e 2tart '' *nine does not liht up 3ithin specified period no $nition or no Fuel.

25. )par8 p#ug Types:

a. Annular'%ap $niter lon Reach.b. Constrained'ap plu.

2. hat Engine 9arts nee' to be Coo#ing:

a. !earins b" oil.a. Turbine shrouds and blades b" hih pressure coolin air.

b. Flam head 3hich e+it from C.C b" air from dilation holes.

c. *nine %ear bo+ b" oil.d. 1il c"cle b" either Air cooled 1il cooler -AC1C/ or -FC1C/.

e. %enerall" 1il C"cle an" mo4able contact Parts and #ot section parts.

2!. +#a'e creep8a. Turbines are subjected to hih centrifual loads plus #eat.

b. The combination of temperature and centrifual loads 3ill induce the turbine blades to

stretch 3hilst the enine is runnin.

c. 1nce the enine has stopped runnin the blades 3ill cool.d. The coolin blade 3ill not return to its oriinal shape and o4er a period of time 3ill tend

to increase slihtl" in lenth. This phenomenon is kno3n as blade creep.

2%. +#a'e Creep Types:

a. Primar" '' occurs rapidl" o4er a relati4el" short period but at a decreasin rate.

b. 2econdar" '' creep rate is small but constant.c. Tertiar" M creep is rapid and leads to Fracture.

2,. Tip C#earance:


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a. 1ne of the man" factors that o4ern the efficienc" of a turbine enine is the maintenance

of minimum clearances bet3een rotatin assemblies.b. The Tip clearance bet3een Turbine blades and 2hrouds must not e+ceed the ma+ allo3ed

clearance.

3-. Engine Contro#s:

a. For3ard thrust throttle controls.b. Re4erse Thrust.c. Fuel control s3itches or le4ers -#P cock controls/.

31. Engine n'ications:

a. *nine instruments can be di4ided into t3o cateories8

i. *nine indication M performance.

-RP0 *PR *%T and Fuel Flo3 rate/

ii. *nine indication M mechanical.b. Airborne &ibration 0onitorin.

c. 1il

-Pressure Temperature Luantit" (o3 pressure indicators/.d. Primar" $ndications must al3a"s be displa"ed at all times 8

-)? *PR *%T/.

e. 2econdar" $ndications 3hich are normall" displa"ed on the lo3er screen8-)5 1il Pressure Parameters &ibration indication/.

32. &ain components use' in an engine in'icating an' cre$ a#ert system:

a. Computers ' aircraft s"stem inputs.

b. Displa" units -CRTs/.

c. Cancel>recall s3itches.

d. 0aintenance s3itches.

33. Thrust *eversers:

a. 0a" use Cold stream

i. !locker door.

b. 0a" use #ot stream8

i. Clamshell doors.

ii. Deflector doors.

iii. Combination of both.

34. Engine (i# )ystem:a. Draw the System.

35. 1il Tank Components look at attached raph8

a. Filler cap 3ith dip stick.b. 2uppl" to enine oil pump.

c. Drain &al4e and line.

d. Return line from sca4enin line.


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e. De'aerator.

f. Luantit" Dip.. %lass 2creen 3ith Luantit" $ndication in %A(.

3. (i# Coo#er Types /)ee ;uestion 20:

a. FC1C.

b. AC1C.

3!. )hip Detectors 00A%)*T$C P(=%28

a. The" are found in the sca4ene lines of a lubrication s"stem.

b. The manetic end is located in the oil flo3 and it 3ill attract an" manetic particlesbein carried alon in the oil.

c. A manetic plu 3ill normall" ha4e a ba"onet fittin 3hich enables Guick and eas"

remo4al for inspection.

d. 1n remo4al a sprin loaded check 4al4e 3ill close pre4entin loss of oil from thes"stem.

e. The debris attracted to these plus 3ill help to indicate an" 3ear on manetic parts 3ithin

the enine.

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