Hydraulics Machines Mock Test

1. A Pelton wheel is

2. The gross or total head of the turbine is the

3. The Thomsons turbine is

4. Slip of a reciprocating pump is defined as the

5. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

6. The static head of a centrifugal pump is equal to the

7. The mechanical efficiency of an impulse turbine is

8. The working of which of the following hydraulic units is based on Pascals law?

9. A hydraulic ram is a device used to

10. Dynamic similarity is said to exist between the model and the prototype, if both of them

11. Kinematic similarity is said to exist between the model and the prototype, if both of them

12. Which of the following statement is correct?

13. Which of the following pump is suitable for small discharge and high heads?

14. The hydraulic efficiency of a reaction turbine, is the ratio of

15. Which of the following statement is correct as regard to water wheels?

16. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

17. The runaway speed of a hydraulic turbine is the speed

18. In the above question, the saving in case of a double acting reciprocating pump is

19. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

20. The speed of an imaginary turbine, identical with the fiven turbine, which will develop a unit power under a unit head, is known as

21. In a Kaplan turbine runner, the number of blades are generally between

22. The overall efficiency of a reaction turbine is the ratio of

23. In a Francis turbine runner, the number of blades are generally between

24. The cavitation in a hydraulic machine is mainly due to

25. The discharge through a reaction turbine

26. Power required to drive a centrifugal pump is directly proportional to

27. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

28. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

29. The undershot water wheels are those in which

30. The flow ratio of Francis turbine is defined as the ratio of the

31. Geometric similarity is said to exist between the model and the prototype, if both of them

32. A hydraulic coupling belongs to the category of

33. Which type of the pump is defferent from others in the same group?

34. Which of the following is not a reaction turbine?

35. Which of the following trubine is preferred for 0 to 25 m head of water?

36. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as

37. In order to avoid cavitation in centrifugal pumps

38. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

39. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

40. In an outward flow reaction turbine

41. Overall efficiency of a centrifugal pump is the ratio of

42. Which of the following pump is sucessfully used for lifting water to the boilers?

43. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

44. Which of the following pump is sucessfully used for lifting water to the wells?

45. A double overhung Pelton wheel has

46. In a reciprocating pump, air vessels are used to

47. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

48. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

49. Which of the following pump is preferred for flood control and irrigation applications?

50. The function of guide vanes in a reaction turbine is to

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