Hydraulic Machines Multiple Choice Questions and Answers for Practice

16. Low specific speed of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

17. Medium specific speea of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

18. High specific speed of turbine implies it is

1. propeller turbine
2. Francis turbine
3. impulse turbine
4. any one of the above

19. The specific speed of turbine is defined as the speed of a unit

1. of such a size that it delivers unit dis-charge at unit head
2. of such a size that it delivers unit dis-charge at unit power
3. of such a size that it requires unit power per unit head
4. of such a size that it produces unit horse power with unit head

20. Any change in load is adjusted by adjusting following parameter on turbine

1. net head
2. absolute velocity
3. blade velocity
4. flow

21. Francis turbine is best suited for

1. medium head application from 24 to 180 m
2. low head installation up to 30 m
3. high head installation above 180 m
4. all types of heads

22. An impulse turbine is used for

1. Low head of water
2. High head of water
3. Medium head of water
4. High discharge

23. Reaction turbines are used for

1. low head
2. high head
3. high head and low discharge
4. low head and high discharge

24. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

1. lift and resultant force
2. drag and resultant force
3. lift and tangential force
4. lift and drag

25. A turbine is a device which converts

1. Kinetic energy in to mechanical energy
2. Mechanical energy in to hydraulic energy
3. Hydraulic energy into mechanical energy
4. None of the above.

26. Centrifugal pump is started with its delivery valve

1. kept fully closed
2. kept fully open
3. irrespective of any position
4. kept 50% open

27. Axial flow pump is started with its delivery valve

1. kept fully closed
2. kept fully open
3. irrespective of any position
4. kept 50% open

28. A centrifugal pump is superior to a reciprocating pump because

1. It is a high speed pump
2. It is more economical
3. It gives smooth flow
4. All the above

29. Which place in hydraulic turbine is most susceptible for cavitation

1. inlet of draft rube
2. blade inlet
3. guide blade
4. penstock

30. The flow rate in gear pump

1. increases with increase in pressure
2. decreases with increase in pressure
3. more or less remains constant with in-crease in pressure
4. unpredictable