f mm assignments

8/13/2019 f Mm Assignments

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Year : SYME (2012-13) Sub: Fluid Mechanics & Machinery (12093)

1

Assignment No. 1

Properties of Fluids

Sr.

No.

Question Exam Marks

1 Define Specific gravity and Specific weight. State its SI unit. Sample PaperE Scheme

2

2 Determine the specific gravity of fluid having viscosity 0.05poise and kinematic viscosity as 0.035 stokes.

Sample Paper

E Scheme4

3 A 5mm diameter glass tube is immersed vertically in water.If the contact angle is 50 find the capillary rise. Take

surface tension for water as 0.074.

Sample Paper

E Scheme4

4 Define specific volume. State its SI unit. S2011 25 Explain the phenomenon of capillary rise with reference to

surface tension.S2011, W2012 4

6 Define the following termsi) Specific Weight ii) Specific gravityiii) Pressure iv) Surface tension

W2011 4

7 Define the termi) Kinematic Viscosity ii) Dynamic Viscosity

W2011 4

8 Define - (1) Specific volume (2) Compressibility S2012 29 Explain - (1) Surface tension (2) Vapour pressure. S2012 410 At a certain point in castor oil the shear stress is

0.216 N/m2and the velocity gradient 0.216 s-1. If mass

density of castor oil is 959.42 kg/m3, find kinematic

viscosity.

S2012 4

11 Define kinematic viscosity and atmospheric pressure.

W2012 212 Define Surface Tension, give its SI unit. MSBTE SampleTest Paper C

Scheme, S20102

13 Specific gravity of oil is 0.76. Calculate its density in kg/mand specific weight in N/m

3.

MSBTE Sample

Theory Paper C

Scheme2

14 Define Kinematic Viscosity and give its SI unit. MSBTE SampleTheory Paper C

Scheme2

15 Find the specific gravity of an oil whose specific weight is7.85 kN/m

3.

W2008 2

16 What is Newtons law of viscosity? W2008 217 Calculate specific weight and density of one liter liquid

which weighs 7 N.S2009 2

18 Define Dynamic Viscosity with its SI unit. S2009 219 Determine the specific gravity of a fluid having viscosity

0.005 N-s/m2and kinematic viscosity 0.035 X 10

-4m

2/sec.

W2009 2

20 Define Newtonian and Non-Newtonian fluid with oneexample each.

W2009 2

21 The density of liquid is 3000 kg/m3. Calculate specific S2010 2


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2

gravity and specific weight of liquid.

22 State Newtons law of viscosity? W2010 223 Find the Kinematic viscosity of an oil having density 980 kg/m3

when at a certain point in the oil, the shear stress is 0.25 N/m 2

and velocity gradient 0.3 /sW2010 4


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3

Assignment No. 2

Fluid Pressure & Pressure measurement

Sr.No.

Question Exam Marks

1. Define the terms Center of pressure and Total pressureon immersed body.

Sample Paper

E Scheme2

2. Draw a neat sketch of inverted U-tube differentialmanometer. Under what pressure conditions it can be

used?

Sample Paper

E Scheme4

3. An Equilateral triangular plate of base 3m and altitude 3mis immersed vertically in an oil of specific gravity 0.8.

Determine total pressure and depth of center of pressure of

plate.

Sample Paper

E Scheme4

4. A close tank contains 0.5 m Hg and 1.5 m water, 2m of oil ofspecific gravity 0.8and air space above the oil, if the pressure

at the bottom of tank is 30 N/cm2gauge. What should be the

reading of the gauge at the top of the tank?

Sample Paper

E Scheme4

5. List the Mechanical gauges for pressure measurement.Explain with a neat sketch the working of Bourdons tubepressure gauge.

Sample Paper

E Scheme8

6. What is meant by i) Total Pressure ii) Centre of pressure onimmersed body?

S2011 2

7. In a given Fig. No. 1 the air pressure intensity at A is 1/10N/mm2(absolute). What is the pressure in N/mm2(absolute)

at B?

Water

Oil of Sp. Gr. 0.9

h1=250 mm

h2=75 h3 = 150mm

Mercury

S2011 4

8. A circular plate of 6 m diameter is held in water in such away that its maximum and minimum depth from surface of

water is 3 m and 9 m. Determine the total pressure on the

S2011 4


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plate and the position of centre of pressure.

9. Draw a sketch of Bourdon gauge and explain how it works. S2011 410. Explain with neat sketch working of differential manometer. S2011 411. For a water column of height 6 m. Calculate

i) Intensity of pressure (KPa)ii) mm of mercuryiii) m of wateriv) N/m2absolute.

S2011 8

12. Convert 10 N/cm2 pressure in oil column of specific gravity0.82.

W2011 2

13. Convert 15cm mercury column equivalent to water column. W2011 214. An isosceles triangular plate base 1.2m & height 2m is

immersed vertically in such a way that the apex is in the

downward direction and the side of base is parallel & 38cm

below free water surface level, determine total pressure.

W2011 4

15. Define the following termi) Vapour pressure ii) Compressibility

ii Gauge pressure iv) Total pressure

W2011 4

16. Differentiate between absolute pressure and gaugepressure

S2012 2

17. A circular plate 1.2 in diameter is placed vertically inwater so that centre of the plate is 2 m below the free

surface. Determine the depth of centre of pressure.

S2012 4

18. Explain working principle of Differential manometerwith neat sketch.

S2012 4

19. Sketch and explain Bourdon pressure gauge S2012 420. Define - (i) Pressure head (ii) Pressure intensity

(iii) Absolute vacuum (iv) Atmospheric pressure

S2012 4

21. Explain concepts of -(i) Total pressure (ii) Centre of pressure

S2012 4

22. What is meant absolute and atmospheric pressure ? W 2012 223. The pressure of a fluid of specific gravity 0.8 flowing in

horizontal pipe line is determined with a simple U tube

mercury manometer .The level of mercury surface in right

limb which is open to atmosphere is 90 mm above the centre

of pipe . The level of mercury in the left limb which is

connected to the pipe is 60 mm below centre of the pipe .

Determine absolute pressure of the fluid in the pipe in

Newtons per square meter .

W 2012 4

24. A circular plate of 6 m diameter is held in water in such waythat its maximum and minimum depth from surface of

water is 3 m and 9 m . Determine the total pressure on the

plate and position of center of pressure .

W 2012 4

25. Draw a sketch of Bourdon pressure gauge and explain howit works .

W 2012 4

26. Define pressure head . How given pressure in pascal can beconverted into required liquid column .

W 2012 4


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5

27. For a water column of height 6 m calculate1)Intensity of pressure (KPa)

2)mm of mercury

3)m of water

4)N/m2

W 2012 4

28. Convert 3.5 bar pressure into equivalent mercury column. S2008 229.30. Draw a labeled diagram of vertical micromanometer. State

the significance of reservoir used in it.S2008,W2008

4

31. A circular plate 2 m diameter is submerged in water such thatits greatest and smallest depths below the free water surface

are 2.8 m and 1 m respectively. Find the inclination of the

plate with water surface, total pressure acting on it and depthof centre of pressure.

S2008 4

32. State Pascals law of fluid pressure W2008S2010 2

33. How can a pressure be expressed in two ways? State theunits.

W2008 2

34. A circular gate of 2 m diameter is immersed vertically in anoil of specific gravity 0.84. Such that its centre is 3 m from

the surface of oil. Find the oil pressure and centre of pressureon the gate.

W2008 4

35. Explain Bourdon tube pressure gauge with a neat sketch. W2008 436. State the different types of manometers and explain any one

of them with figure.W2008 4

37. Explain the concept of Atmospheric pressure, Gauge pressureand Absolute pressure.

W2008S2010

SampleQuestion

Paper

4

38. Convert 30 cm of oil column in N/m . Take specific gr. Of oil1.2

S2009 2

39. A tube manometer is used to measure pressure of oil sp. gr.0.85 flowing in a pipe line. Its left end is connected to pipe

and right limb is open to atm. The centre of pipe is 100 mm

below level of mercury in right limb. If difference of mercury

level in two limbs is 160 mm. Find absolute pressure in KPa.Take sp. gr. Of mercury = 13.6.

S2009 4

40. Draw neat labeled sketch of inverted U tube differentialmanometer. When it is be used,

S2009S2010

4

41. The tank shown contains water under pressure. Calculatetotal pressure on side and bottom of tank. Take tank is 2.5 m

wide perpendicular to plane of paper.

4 m

5 m


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2 m0.7

6 m

42. Define Total pressure and Centre of pressure. W2009W2010

2

43. A 4 m X 4 m square plate is immersed in water with one ofits diagonals vertical. Its centroid lies at a depth of 8 m fromthe free water surface. Calculate the total pressure on the

plate and locate position of centre of pressure with respect to

the plate centroid.

W2009 4

44. An open tank contains water up to a depth of 2 m and aboveit an oil of specific gravity 0.9 for a depth of 1 m. Find the

pressure intensity:i) at the interface of two liquidsii) at the bottom of tank.

W2009 4

45. A circular plate of diameter 1m is immersed in water in sucha way that the least depth of immersion is 0.5 m and max

depth of immersion is 1 m. Find the depth of centre ofpressure

S2010 4

46. Convert 25 bar into MPa W2010 247. Draw a neat and labeled sketch of Inclined Micromanometer,

Write the equation for pressure head.W2010 4

48. Rectangular sluice gate is situated on the vertical wall oflock. The vertical side of the sluice is (d) meters in length and

depth of centroid of the area is (p) meters below the water

surface. Find the centre of pressure.

W2010 4


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49. A differential manometer is connected at points A and B oftwo pipes as shown in fig. no. 1 The pipe A contains a liquid

of Sp. Gr. = 0.9. The pressure at A and B are 1 kg/cm2and

1.80 kg/cm2

respectively. Find the difference in mercury

level.

Sp. Gr. = 1.5

Pa= 1 kg/cm2 3m

Sp. Gr.=0.9

2m

Pb=1.8 kg/cm2

h

Mercury

W2010 6


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Assignment No. 3

Fluid Flow

Sr.

No.

Question Exam Marks

1 Define laminar flow and turbulent flow. Sample PaperE Scheme 2

2 Draw a neat sketch of venturimeter. State why the length ofdivergent cone is made longer?

Sample Paper

E Scheme4

3 A 5m long tapered pipe is inclined at an angle of 15 withhorizontal. Diameter of the pipe at top end is 0.24 m and

that at bottom end is 0.08 m. find the pressure difference

between the two ends if the velocity of water at bottom end

is 2 m/s.

Sample Paper

E Scheme8

4 An Orifice meter with orifice diameter 15 cm is inserted in apipe of 30cm diameter. The pressure gauge fitted upstream

and downstream of the orifice meter give readings of 14.715

N/cm2 and 9.81 N/cm2 respectively. Find the rate of flowof water through the pipe in litres / sec. Take Cd = 0.6.

Sample Paper

E Scheme

8

5 State any four types of fluid flows. S2011 46 A Venturimeter is installed in a pipe line 30 cm diameter.

The difference of pressure at entrance and throat read by

mercury manometer is 5 cm, when water flows at a rate of

0.05 m3/sec. If the discharge co-efficient of meter is 0.96,

determine the diameter of throat.

S2011 4

7 State the laws of fluid friction for laminar flow. Also explainhydraulic gradient line and total energy line with sketch.

S2011 8

8 Explain construction principle of working of orifice meter.Also write the equation for discharge through orificemeterand state the meaning of each term used. S2011 8

9 A pitot tube directed into a water stream having a velocity of2.7 m/sec. It has gauge difference of 30 mm on the water

mercury manometer. Find its coefficient. Also explain

construction and working of pitot tube with neat sketch.

S2011 8

10 In case of Venturimeter why the length of divergent cone ismore than that of convergent cone.

W2011 4

11 List out the discharge measuring devices and draw a neatlabeled diagram of Venturimeter.

W2011 4

12 Define the following termi) Uniform flow ii) Steady flow

iii) Turbulent flow iv) Rotational flow

W2011 4

13 State the Bernoullis theorem and give the assumption madewhile deriving it.

W2011 4

14 If the pitot tube shows 15.5 cm of water determine thevelocity of water. If area of flow is 5.88 cm

2determine the

discharge of water in lit/sec.

W2011 4

15 A Venturimeter having throat diameter 5.3 cm is providedon a pipe of 10 cm diameter. If oil of specific gravity 0.85 is

flowing in upward direction, determine the venturei head

W2011 4


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and the discharge if the manometer shows 12.80 cm of

mercury deflection. If the vertical distance between inlet and

throat is 22 cm. Determine the actual head of Venturimeter.

Assume Cd= 0.65

16 State Bernoullis theorem. Write Bernoullis theorem inenergy and head form.

S2008 4

17 A multistoried building is 380 m above the street. If thepressure of 170 KPa is required in a water pipe line at the top

of the building. What is the pressure at the basement of the

building 9 m below street?

S2008 4

18 Draw a neat sketch of venturimeter. State why the length ofdivergent cone is made larger.

S2008

SampleQuestion

Paper

4

19 A 25 cm diameter pipe carries oil of specific gravity 0.9 at avelocity of 3 m/s. At another section the diameter is 20 cm.

Find velocity at this section and mass rate flow of oil.

S2008 6

20 Explain the total energy of a liquid particle in motion. W2008 421 Draw the diagram of venturimeter and explain its use. Also

write the equation for discharge.W2008 4

22 Write the construction and working of a Pitot tube. W2008 423 Derive the equation for discharge through an Orifice meter. W2008 424 A venturimeter has an area ratio 9 : 1. The larger diameter

being 300 mm. During the flow, the recorded pressure is the

large section is 6.5 m and that at the throat is 4.25 m. If the

meter coefficient C = 0.99. Calculate the discharge through

the meter.

W2008 4

25 Define steady flow with an example. S2009 226 State Bernoullis theorem. Explain how it can be applied to

Pitot tube by using mathematical equation.S2009 4

27 An orifice meter with orifice diameter 15 cm is inserted in apipe of 30 cm diameter. The pressure difference measured bymercury oil differential manometer is 50 cm of Hg. Find rate

of flow of oil sp. gr. 0.9. Take Cd = 0.64

S2009 4

28 Define compressible and incompressible flow. Water flowsdown an inclined tapered pipe 45 m long at slope of 1 : 10.

The areas at upper and lower ends of pipe are 8 m2and 3 m

2

resp. If velocity at lower end is 4.5 m/s and pressure at upperend is 100 KPa, calculate pressure at lower end and rate of

flow.

S2009 8

29 State continuity equation and meaning of each term, forincompressible flow. Explain working principle of

venturimeter.

S2009 6

30 Explain the principle of working of Pitot tube with neatsketch

W2009

S20104


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31 A 30 cm X 15 cm venturimeter is inserted in a vertical pipecarrying water flowing in the upward direction. A differential

mercury manometer connected to the inlet and throat gives areading of 20 cm. Find the discharge. Take Cd= 0.98

W2009 4

32 Define Rotational and Irrotational flows. Define rate of flowwith its unit in SI system.

W2009 6

33 Define uniform and non uniform flow. S2010 234 State Bernoulliss theorem. Explain meaning of each term in

it.S2010 4

35 A horizontal venturimeter 160 X 80 mm used to measureflow of an oil specific gravity 0.3 . Determine deflection of

oil mercury gauge if discharge of oil is 50 lit/sec. Take Cd= 1

S2010 4

36 A pipe through which water is flowing is having diameters 40cm and 20 cm at section 1 and 2 respectively. The velocity of

water at section 1 is given 5 m/s. Find the velocity head at

sections 1 and 2 and also rate of discharge

W2010 4

37 Draw a neat sketch of venturimeter. Define venturi head. W2010 438 Define the following flow i) Steady flow ii) Non-uniform

flow iii) Rotational flow iv) Laminer flow.W2010 4

39 State Bernoullis theorem. Write the assumptions made in it. W2010 440 Find the total energy of flowing water from the following

data in KJ

Diameter of pipe1200mmFlow rate360 lps

Pressure - 3 bar

Location of pipe3000 mm from ground level.

W2010 4

41 Define laminar flow and turbulent flow SampleQuesti

on

Paper

2

42 A 5m long tapered pipe is inclined at an angle of 15 withhorizontal. Diameter of the pipe at top end is 0.24m and that

at bottom end is 0.08m. Find the pressure difference betweenthe two ends if the velocity of water at bottom end is 2 m/s.

Sample

Questi

onPaper

4

43 An orifice meter with orifice diameter 15 cm is inserted in apipe of 30cm diameter. The pressure gauge fitted upstream

and downstream of the orifice meter gives reading of 14.715

N/cm2and 9.81 N/cm

2respectively. Find the rate of flow of

water through the pipe in liters/sec. Take Cd0.6

Sample

Question

Paper

4


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Assignment No. 4

Flow Through Pipes

Sr.No.

Question Exam Marks

1 What are the major and minor losses in pipe. Sample PaperE Scheme

2

2 Identify all losses of arrangement shown in the fig.-1 andgive their appropriate formulae

Velocity = V1 Velocity = V2

d1 d2

l1 l2

Sample Paper

E Scheme4

3 Find the head loss due to friction in pipe of diameter 30 cmand length 50 m through which water is flowing at

velocity3m/sec use Darcys formula. Take kinematic

viscosity as 0.01stokes.

Sample Paper

E Scheme4

4 Water at a head of 300 m is supplied to a pipe of diameter 40cm and length 4m. Assume f = 0.009. Calculate the

following.

i. Power transmitted when velocity is 1.5 m/s.

ii. Maximum power transmitted.

iii. Power transmitted when velocity is 3.2 m/s.

iv. Draw the graph power transmitted v/s velocity.

Sample Paper

E Scheme8

5 Write Chezys equation. State the meaning of each term. S2011 26 A pipe 850 m long connects two reservoirs whose level

difference is 50 m. Find the discharge in pipe in liters/sec,

if diameter of pipe is 0.5 m. Take all losses into account.

Assume f = 0.01

S2011 4

7 Find the maximum power that can be transmitted by apower station through a hydraulic pipe 3 km long and 0.2

m diameter. The pressure at the power station is 60 bars.

Take f=0.0075

S2011 4

8 With the help of a neat sketch explain Hydraulic gradientline and total energy line.

W2011 4

9 A pipe line consist of 10 cm diameter for 105 meter and7.2 cm for the next 68 m. carries water at the rate of 22

lit/sec if f=0.0005 Determine Major and Minor losses.

W2011 8

10 List the major and minor losses in a flow through pipe. Giveappropriate formulae.

S2008 4

11 A pipe line AB of diameter 300 mm and of length 400 mcarries at the rate of 50 lps. The flow takes place from A to Bwhere point B is 30 m above A. Find the pressure at A if the

S2008 6


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pressure at B is 19.62 N/cm . Take F = 0.008.

12 That are the major and minor losses in a flow through pipe?Explain.

W2008 4

13 The pressure at the inlet of a pipeline is 1000 Kpa andpressure drop is 200 Kpa. The pipeline is 1.5 km long. If 100

kW is to be transmitted over this pipeline, find the diameter

of the pipe and efficiency of transmission. Take f = 0.006

W2008 8

14 State the meaning of HGL and TEL. Show HGL and TEL inthe fig.

d1

d2 d3

l1 l2l3

S2009 4

15 The difference in water surface levels in two tanks, which areconnected by three pipes in series of lengths 300 m, 150 m,

200 m and of dia. 30 cm, 20 cm, 40 cm resp. is 15 m. Find

rate of flow of water in lit./s if coe. Of friction are 0.005,0.0052, 0.0048 resp. neglecting minor losses.

S2009 6

16 State the laws of fluid friction for turbulent flow. W2009 417 Find the head lost due to friction in a pipe of diameter 300

mm and length 50 m, through which water is flowing at a

velocity of 3 m/sec. Using :

i) Darcys formulaii) Chezys formula for which C = 60 take F = 0.0256

W2009 4

18 Obtain the condition for maximum transmission of powerthrough the pipe.

W2009 8

19 Write Darcys equation to find loss of head due to friction. S2010 220 List different types of minor losses. S2010 421 Pipe diameter 25cm is suddenly enlarged to diameter of

50cm. If pipe carries 350 lit/s. Find loss of head due toexpansion.

S2010 4

22 Write the formula for head lost due to friction. State themeaning of each term.

W2010 2

23 A pipe of diameter 300mm and length 3500m is used for thetransmission of power by water. The total head at the inlet of

W2010 4


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pipe is 500m. Find the maximum power available at the

outlet of the pipe, if the value of f=0.006

24 What are the major and minor losses in pipe. Sample Questionpaper

2

25 Find the head lost due to friction in pipe of diameter 30 cmand length 50 m through water is flowing at velocity 3m/s.

Use darcys formula. Take kinematic viscosity as 0.01 stokes.

Sample Question

paper

4

26 Water at a head of 300m is supplied to a pipe of diameter40cm and length 4m. Assume f= 0.009. Calculate the

following

i) Power transmitted when velocity is 1.5 m/sii) Maximum power transmitted.iii) Power transmitted when velocity is 3.2 m/siv) Draw the graph power transmitted v/s velocity

Sample Question

paper4


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Assignment No. 5

Impact of Jet

Sr.No.

Question Exam Marks

1 Define the term impact of jet. Sample PaperE Scheme

2

2 A jet of water of 5 cm diameter with a velocity of 12 m/sstrikes a fixed curved vane at an angle of 35 and the jet

leaves the vane at an angle of 20. If there no frictional

losses, find the normal and tangential forces of the jet on the

vane.

Sample Paper

E Scheme4

3 Draw a neat ketch for impact of jet on a moving vertical flatplate and write the formula to determine the work done with

the meaning of each term.

Sample Paper

E Scheme4

4 A jet of water of 0.05 m diameter with a velocity of 15 m/simpinges on a series of vanes moving with a velocity of 6 m/s.

Find i) Force exerted by the jet, ii) Work done by the jet,

iii) Kinetic energy of the jet and iv) Efficiency of the jet.

Sample Paper

E Scheme4

5 A jet of water strikes on series of cup shaped vanes whichdeflect it through 1650. If the velocity of jet is that

corresponding to a head of 40m and velocity of vanes is such

that the efficiency is maximum. Find the work done on vane

per kg of water.

S2011 4

6 Draw a neat sketch for impact of jet on a moving verticalflat plate and write the formula to determine the work done

with the meaning of each term.

S2011 4

7 A jet of water 80 mm diameter moving with a velocity 20m/sec, strikes a stationary plate. Find the normal force on

the plate, when

i) The plate is normal to the jetii) The angle between jet and the plate is 300.

S2011 4

8 A jet of water diameter 5 cm and velocity 30 m/sec strikingon a curved blade having an angle 135

0at outlet, determine

force workdone and efficiency if

i) A single fixed bladeii) A single moving blade moves with 18 m/sec in the

direction of jet

W2011 8

9 Define the term impact of jet. S2011, W2012,S2012

2

10 A jet of water 50 mm diameter is discharging under aconstant head of 70 meters. Find the force exerted by

the jet on a fixed plate. Take coefficient of velocity as

0.9

S2012 4

11 A jet of water 75 mm in diameter having velocity of20 m/s. strikes of the flat plates arranged around the

periphery of a wheel such that each plate appears

successively before the jet. If the plates are moving at

a velocity of 5 m/s, compute the force exerted by the

S2012 4


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jet on the plate, the work done per second on the

plate and the efficiency of the jet.12 A jet of water 50 mm diameter , moving with a velocity of

15m/sec . impinges on a series of vanes moving with a

velocity of 6m/sec. Find 1)Force exerted by the jet .

2) Workdone by the jet .3)Efficincy

W2012 8

13 Draw a neat sketch of jet on a fixed vertical flat plate andwrite the formula to determine force exerted by the jet and

state the meaning of each term .

W2012 4

14 Draw inlet and outlet velocity diagram of impact of jet onmoving curved vanes.

W2012 4

15 A jet of water of diameter 7.5 cm strikes a curved plate at itscentre with a velocity of 20 m/sec. The curved plate is

moving with a velocity of 8 m/sec. in the direction of jet. The

jet is deflected through an angle of 1650. Assuming plate to

be smooth. Findi) Force exerted on the plate

ii) Power of the jetiii) Efficiency of jet

S2008 4

16 Water is flowing through a pipe with a nozzle at one end. Thediameter of nozzle is 100 mm and head of the water at thecentre of nozzle is 100 m. Find force exerted by the jet on a

fixed vertical plate. Take coefficient of velocity as 0.98

S2008 4

17 A jet of water 50 mm in diameter, moving with a velocity 15m/s, impinges on a series of vanes moving with a velocity of

6 m/s. Findi) Force exerted by the jet

ii) Work done by the jet and

iii) efficiency of the jet.

W2008 8

18 A flat plate is stuck normally by jet of water 50 mm indiameter with velocity of 25 m/s. Calculate work done persecond.

S2009 4

19 Why single flat plate moving continuously in one direction isnot useful in actual practice? What is done in actual practice,

show by sketch.

S2009 4

20 A jet of water of diameter 10 cm strikes a flat plate normallywith a velocity of 15 m/sec. The plate is moving with a

velocity of 6 m/sec in the direction of jet. Find

i) Force exerted by the jet on the plate

ii) Work done by the jet on the plate per sec.

W2009 4

21 A jet of water having a velocity of 40 m/s strikes a curvedvane, which is moving with a velocity of 20 m/s. The jet

makes an angle of 300with the direction of motion of vane at

inlet and leaves at angle of 900

to the direction of motion ofvane at outlet. Draw the velocity triangles at inlet and outlet

and determine the vane angles at inlet and outlet so that the

water enters and leaves the vane without shock.

W2009 4


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22 State the procedure for drawing the inlet and outlet trianglesfor moving curved vanes with usual notations. [ Note: Jet

striking a moving curved vanes at one of the tips]

S2009W2009

6

23 A jet of water 50 mm in dia. Under constant head of 50mimpinges on a fixed blade normally. Find force exerted by jetif coefficient of velocity is 0.95.

S2010 4

24 A jet of water having velocity 35 m/sec impinges on a seriesof vanes moving with velocity 20m/sec. The jet makes an

angle of 300to the direction of motion of vanes when

entering and leaving an angle of 1200. Draw triangles of

velocities at inlet and outlet,Find

1. Angle of vane tip so that enters and leaves with outstock.

2. Work done per unit weight of water entering vanes3. Efficiency

S2010 6

25 A jet of water having velocity 15m/sec strikes a curved vanewhich is moves with velocity of 5m/sec in the same direction

as that of jet at inlet. The vane is so shaped that the jet isdeflected through 135

0. The dia of jet is 100mm.Assume vane

to be smooth, find:

1. Force exerted by jet on the vane in the direction ofmotion

2. Power output of a vane3. Efficiency of a vane

W2010 4

26 A tank has two identical orifices in one of its vertical sides.The upper orifice is 3m below the water surface and lower

one is 5m below the water surface. If the value of Cvfor each

orifice is 0.96, find the intersection of two jets.

W2010 6

27 A pipe of dia 300mm and length 3500m is used for thetransmission power by water. The total head at the inlet of thepipe is 500m. Find the max. power available at the outlet of

the pipe, if the value of f=0.006.

W2010 6


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Assignment No. 6

Hydraulic Turbines

Sr.No.

Question Exam Marks

1 State different types of draft tubes for reaction turbine. Sample PaperE Scheme

2

2 Distinguish between impulse turbine and reaction turbineon the basis of principles of working, pressure head,

discharge and application.

Sample Paper

E Scheme4

3 A pelton wheel operates under a head of 300 m with aspeed ratio 0.5. The buckets are bent backwards by 30

0.

Determine the power developed per unit weight of water

flow.

Sample Paper

E Scheme8

4 With the help of neat sketch explain the construction andworking of Kaplan turbine.

Sample Paper

E Scheme8

5 Define cavitations in turbines. S2011 26 What are different types of draft tubes. Explain any one

with neat sketc. S2011 4

7 A pelton wheel 2.5 m diameter operates under thefollowing conditions.

Net available head = 300 m, speed = 300 rmp

Coefficient of velocity of jet = 0.98

Blade friction coefficient = 0.95, Blade angle = 1650

Diameter of the jet = 20 cm, Mechanical efficiency = 0.95

Determine: i) Power developed

iii) Hydraulic efficiencyiv) Specific speed.

S2011 8

8 Compare Kaplan turbine and Fransis turbine. S2011 89 Draw the inlet and outlet velocity triangle for the buckets

in Pelton wheel with the meaning of the terms.W2011 4

10 Explain with a neat sketch Governing of a Pelton Wheel. W2011 411 Why draft tube is provided in case of a Reaction Turbine.

Sketch elbow type circular draft tube.W2011 4

12 Define the term Specific speed in case of a turbine. If thespecific speed of a turbine is 68 rpm, determine the type

of a turbine.

W2011 4

13 What is the difference between Impulse Turbine andReaction Turbine give atleast eight points.

W2011 8

14 A pelton wheel working under a head of 50 m develops 80KW at 230 rpm. Calculate the diameter of jet if the overall

efficiency is 78 %. Assume Cv= 0.98

S2008 8

15 Draw outlet velocity triangles for slow, medium and fastrunner of a pelton wheel with usual notations.

S2008 6

16 State the function of nozzle in a Pelton turbine. W2008 217 Draw a layout of a hydro-electric power plant and explain. W2008 818 A pelton wheel working under a head of 500 meters,

produces 13000 kW at 430 rpm. If the efficiency of the wheelW2008 6


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18

is 85 % determine

i) the discharge of turbine

ii) diameter of wheel andiii) diameter of nozzle

19 Differentiate between Impulse Turbine and Reaction Turbine. W2008 620 Explain the construction and working of a Kaplan Turbine. W2008 621 Classify turbines according to direction of flow. S2009 222 Two jet strike the buckets of pelton turbine which is having

shaft power as 15500 kW. The diameter of each jet is 200

mm. If net available head on the turbine is 400 mm. Findoverall eff. Of turbine. Take Cv= 1.0

S2009 4

23 State name of turbine you select for. High speed and minimum discharge Minimum discharge and high head Moderate discharge and head Max. discharge and low head

S2009 4

24

A pelton wheel having semi circular buckets is 1 m in dia.Pressure head at nozzle when it is closed is 15 bar. The

discharge when nozzle is open is 3.5 m3/min. If speed is 600

rpm. Calculate power developed and hydraulic efficiency.Take Cv= 0,98, o = 85 %

S2009 4

25 State the types of draft tubes.W2009 2

26 Draw a neat sketch of Pelton wheel showing all importantcomponents. Give complete classification of Pelton wheel.State the shape of bucket. W2009 4

27 An inward flow reaction turbine has external and internaldiameters as 1 m and 0.5 m respectively. The velocity of flowthrough the runner is constant and is equal to 1.5 m/s.

Determine:

i) Discharge through the runner.ii) Width of the turbine at outlet if the width of the

turbine at inlet = 200 mm.

W2009 8

28 A pelton wheel is having a mean bucket diameter of 1 m andis running at 1000 r.p.m. The net head on the Pelton wheel is700 m. If jet gets deflected through an angle of 165

0and

discharge through nozzle is 0.1 m3/s. Find:

i) Power available at the nozzle andii) Hydraulic efficiency of the turbine

W2009 6


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Assignment No. 7 (Centrifugal Pumps)

Sr.

No.

Question Exam Marks

1 List the various losses in Centrifugal pump. Sample PaperE Scheme

2

2 With the help a neat labeled sketch, explain in brief thefunctioning of volute casing of a centrifugal pump.

Sample Paper

E Scheme 4

3 State any four reasons for the fault no liquid delivered infault finding of centrifugal pump? Suggest probable

remedies also.

Sample Paper

E Scheme4

4 A centrifugal pump having impeller diameters 0.3 m and 0.6m at inlet and outlet respectively is running at 1000 rpm.

The vanes are curved back at an angle of 30 at outlet. If the

velocity of flow through the impeller is 3 m/s constant.

Find i) Vane angle at inlet and

ii) Work done per kg of water on the wheel.

Sample Paper

E Scheme8

5 What is priming? S2011 26 Explain construction and working of submersible pump. S2011 47 Write any eight applications of centrifugal pump. S2011 48 State and explain the possible causes if centrifugal pump fail

to start pumping.S2011 8

9 What is priming? Why it is required in case of a centrifugalpump.

W2011 4

10 List out the various types of casings used in centrifugalpump and draw neat sketch of volute casing.

W2011 4

11 Centrifugal pump not delivering water give atleast fourreasons and remedies.

W2011 4

12 A Centrifugal pump works against 10 m at 1000 rpm. Thevanes are curved back at an angle of 30

0

to the tangent at theouter periphery. The impeller diameter is 30 cm and has

width 5 cm at outlet. Determine the discharge if manometric

efficiency is 95%, also determine power required to operate

overall efficiency is 65%

W2011 8

13 State hydraulic function of casing which is used forcentrifugal pump.

S2008 2

14 What is NPSH for centrifugal pump? How it is calculated?What is significance in the installation of centrifugal pump?

S2008 4

15 What is priming? Why it is necessary for centrifugal pumps? S2008 416 Draw inlet and outlet velocity triangles for impeller of

centrifugal pump when the impeller is havingi) Backward curved vaneii) Radial vaneiii) Forward curved vane.

S2008 8

17 The internal and external diameters of impeller of centrifugalpump are 200 mm and 400 mm respectively. The pump is

running at 1200 rpm. The vane angles at inlet and outlet are

200 and 300 respectively. The water enters the impellerradially and velocity of flow is constant. Determine the

S2008 8


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20

workdone by the impeller per unit weight of water.

18 Explain the different types of casing for a centrifugal pump. W2008 619 A centrifugal pump delivers 30 litres of water per second to a

height of 18 meters through a pipe 90 m long and 100 mm

diameter. If the overall efficiency of the pump is 75 % Find

the power required to drive the pump. Take f = 0.012

W2008 6

20 Draw neat labeled sketch ofi) Vortex casingii) Volute casing S2009 4

21 State the meaning of NPSH. A centrifugal pump has animpeller with outer dia. Of 70 cm and inner dia. Of 35 cm.

Angles of vane at inlet and outlet are 400and 25

0resp. The

width at the inlet is 7 cm and outlet 3 cm. Pump runs at 1440

rpm. Assume radial entry at inlet of the pump and vanes bentbackwards, calculate discharge, power required to drive the

pump.

S2009 8

22 State any three troubles and their remedies commonlyexperienced during operation of centrifugal pump. S2009 6

23 Draw a neat labeled sketch of multi stage centrifugal ofpump. Why priming is necessary? Give reason.

W2009 8

24 Define Suction Lift and Suction Head for a centrifugalpump. Draw the block diagram showing the position ofcentrifugal pump with respect to suction lift and suction head.

In which position priming is not necessary?

W2009 4

25 Name different types of casing used for centrifugal pump.Explain any one of them with neat sketch and label sketch.

W2009 8

26 The outer diameter of an impeller of a centrifugal pump is400 mm and outlet width 50 mm. The pump is running at 800

r.p.m. and is working against a total head of 15 m. The vane

angle at outlet is 400and manometric efficiency is 75%.

Determine:

i) Velocity of flow at outletii) Velocity of water leaving the vaneiii) Angle made by the absolute at outlet with

the direction of motion at outlet and

iv) Discharge

W2009 6

27 List the different type of casing used in centrifugal pump withtheir application.

S2010 4

28 A centrifugal pump has an impeller of 500mm external diaand 350mm internal dia and runs at 1000rpm. The vanes areset back an angle of 30

0to outer rim. If radial velocity of

water through impeller is maintained constant at 2m/sec.

Find:1. Angles at inlet2. Velocity of water outlet3. The work done when velocity at inlet circumference

S2010 6


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21

of the wheel is half the velocity of outer

circumference of the wheel.

29 State any two faults in centrifugal pumps and their remedies. S2010 630 Stat any four reasons for the fault no liquid delivered in

fault finding of the centrifugal pump.W2010 4

31 Define the following terms with respect to centrifugal pump:1. Total head2. Manomatric head3. Manometric efficiency4. Overall efficiency

W2010 4

32 A centrifugal pump is to discharge water at the rate of 110litres/sec at the speed of 1450rpm.Against the head of 23m.

The impeller dia is 250mm and its width is 50mm. If

manometric efficiency is 75% determine vane angle at outerperiphery.

W2010 6

Assignment No. 8 (Reciprocating Pumps)

Sr.No.

Question Exam Marks

1 Define separation in Reciprocating pump. Sample PaperE Scheme

2

2 Draw the indicator diagram considering both accelerationhead and friction head for reciprocating pump.

Sample Paper

E Scheme8

3 Explain the construction and working of double actingreciprocating Pump with the help of neat sketch. Why the

reciprocating pump is called as the Positive displacement

pump.

Sample Paper

E Scheme8

4 Define i) Slip ii) Negative slip S2011 25 Define the term Negative Slip why it takes place in case of

Reciprocating pump. W2011 46 What is the difference between Centrifugal pump and

Reciprocating pump. Give atleast eight points.W2011 8

7 With the help of neat indicator diagram explain theseparation and Cavitation in the Reciprocating pump. What

are the effects and how to minimize it.

W2011 8

8 Explain the concept of vapour pressure. S2011 49 Explain construction, working principle and applications

of double acting reciprocating pumps.S2011 8

10 High speed is not desirable in reciprocating pump. Givereasons. State advantages of air vessel when used on

suction side.

S2011 8

11 Define slip in case of reciprocating pump. S2008 212 Distinguish between centrifugal pump and reciprocating

pump on the basis of working principle, pressure head anddischarge.

S2008 4

13 Describe with a neat sketch the working of single actingreciprocating pump.

S2008 8

14 Why is a reciprocating pump not coupled directly to themotor? Give reason.

S2008 6


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15 Draw a neat sketch of double acting reciprocating pump andlabel the components.

S2008 6

16 Draw an indicator diagram with effect of accelerator headand frictional head for a reciprocating pump.

W2008 6

17 What isve slip in case of reciprocating pump? When itoccurs? Also explain cavitation.

S2009 4

18 Draw theoretical indicator diagram for reciprocating pump. S2009 419 State applications of reciprocating pump. State differences

between reciprocating pump and centrifugal pump. (any four)S2009 6

20 Draw a neat and labeled indicator diagram considering theeffect of acceleration and friction in suction and delivery

pipes in case of single acting reciprocating pump.

W2009 4

21 What is an air vessel? Explain the function of the air vesselfor reciprocating pumps. Sketch the system. List the types offluid flows.

W2009 6

22 Explain function of air vessel related to reciprocating pump. S2010 423 Diff. between reciprocating and centrifugal pump. S2010 824 Draw indicator diagram considering both acceleration and

friction head for reciprocating pump.S2010 6

25 What is air vessel? To which pump is used. State three mainreasons.

W2010 4


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Question Bank for Skill Test of Fluid Mechanics & Machinery (SYME)

A) Each question contains 2 marks

a) What is use of dead weight pressure gauge?a) Differentiate between intensity of pressure & pressure head.a) Give any two examples of negative pressure.a) What are types of manometersa) What are types of gaugesa) State Bernoullis theorem.a) What is meant by T.E.L. & H.G.L.a) Why length of divergent cone is more than convergent cone.a) What is meant by Cc, Cv, Cd?a) What are major losses?a) What is meant by minor losses. List Thema) What is meant by impulse turbine?a) What is meant by reaction turbine?a) Why hemispherical buckets are used for Pelton wheel.a) What does priming of pump mean?a) What is meant by manometric heada) What is principle of pump.a) What is principle of turbine.

B) Each question contains 6 marks

1) How overall efficiency of centrifugal pump is calculated in experiment.

2) How overall efficiency of pelton wheel is calculated in experiment.

3) How coefficient of friction is calculated in the experiment.

4) How minor losses are calculated in the experiment.

5) How actual discharge & theoretical discharge is calculated in experiment.

6) What are the specifications of Kaplan turbine at Kanher Hydropower plant (any 6

point)

7) Differentiate Francis turbine & Kaplan turbine on any 6 points.

8) Differentiate centrifugal pump & reciprocationg pump on any 6 points.

9) Differentiate impulse turbine & reaction turbine on any 6 points

f mm assignments

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