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hydraulic machines MCQs

Practise focused hydraulic machines questions with marked answers for exam preparation and subject revision.

hydraulic machines Mcqs
1. In axial flow fans and turbines, fluid enters and leaves as follows________________?
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A. axially, axially

B. axially, radially

C. combination of axial and radial

D. radially, radially

E. radially, axially

2. In reaction turbine, draft tube is used_____________________?
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A. none of the above

B. to transport water downstream without eddies

C. to increase flow rate

D. for safety of turbine

E. to convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
3. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of____________________?
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A. necessity of air vessel

B. all of the above

C. lower discharge

D. lower speed of operation

E. high initial and maintenance cost
4. In a centrifugal pump casing, the flow of water leaving the impeller, is___________________?
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A. forced vortex

B. free vortex motion

C. none of the above

D. rectilinear flow

E. radial flow

5. In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?
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A. straight

B. bent forward

C. radial

D. given aerofoil section

E. bent backward
6. High specific speed of turbine implies it is__________________?
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A. any one of the above

B. impulse turbine

C. Francis turbine

D. propeller turbine

E. none of the above

7. Axial flow pump is started with its delivery valve________________?
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A. none of the above

B. kept 50% open

C. irrespective of any position

D. kept fully open

E. kept fully closed

8. Pressure intensifier increases the pressure in proportion to____________________?
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A. fourth power of ratio of diameters

B. ratio of diameters

C. inverse ratio of diameters

D. square of inverse ratio of diameters

E. square of ratio of diameters
9. For small discharge at high pressure, following pump is preferred_____________________?
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A. reciprocating

B. mixed flow

C. centrifugal

D. propeller

E. axial flow

10. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?
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A. steep

B. first rise and then fall

C. none of the above

D. nearly horizontal

E. horizontal

11. High specific speed of a pump implies it is_____________________?
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A. centrifugal pump

B. any one of the above

C. axial flow pump

D. mixed flow pump

E. none of the above

12. Multistage centrifugal pumps are used to obtain___________________?
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A. pumping of viscous fluids

B. high head

C. high discharge

D. high head and high discharge

E. high efficiency

13. Indicator diagram of a reciprocating pump is a graph between________________?
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A. flow vs swept volume

B. pressure in cylinder vs swept volume

C. swept volume vs speed

D. flow vs speed

E. pressure vs speed

14. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?
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A. horizontal

B. first rise and then fall

C. steep

D. nearly horizontal

E. none of the above

15. Puck up the wrong statement about centrifugal pump_______________?
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A. Power a speed3

B. none of the above is wrong

C. head a speed2

D. discharge a diameter

E. head a diameter

16. According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?
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A. as square root of density

B. as square of density

C. directly as the air or gas density

D. inversely as square root of density

E. inversely as density
17. Which place in hydraulic turbine is most susceptible for cavitation __________________?
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A. draft tube exit

B. penstock

C. inlet of draft rube

D. blade inlet

E. guide blade

18. According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?
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A. square root of fan speed

B. directly as fan speed

C. none of the above

D. cube of fan speed

E. square of fan speed

19. Maximum impulse will be developed in hydraulic ram when ___________________?
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A. waste valve closes suddenly

B. supply pipe is long

C. supply pipe has critical diameter

D. ram chamber is large

E. supply pipe is short

20. Centrifugal pump is started with its delivery valve __________________?
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A. kept fully closed

B. kept 50% open

C. kept fully open

D. irrespective of any position

E. none of the above