1. Which of the following pump is sucessfully used for lifting water to the boilers?
Correct : C. Jet pump
2. The flow ratio in case of Francis turbine varies from
Correct : A. 0.15 to 0.3
3. Which type of the pump is defferent from others in the same group?
Correct : D. Plunger pump
4. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as
Correct : B. mechanical
5. The working of which of the following hydraulic units is based on Pascal's law?
Correct : D. Hydraulic press
6. A draft tube is used with impulse turbines.
Correct : B. No
7. The static head of a centrifugal pump is equal to the
Correct : C. sum
8. The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine.
Correct : A. Yes
9. A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
Correct : B. False
10. A Francis turbine is an outward flow reaction turbine.
Correct : B. False
11. The mechanical efficiency of an impulse turbine is
Correct : B. ratio of the actual work available at the turbine to the energy imparted to the wheel
12. In a Francis turbine runner, the number of blades are generally between
Correct : D. 16 to 24
13. The function of guide vanes in a reaction turbine is to
Correct : D. all of the above
14. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
Correct : B. cavitation will be formed
15. Manometric head is the actual head of water against which a centrifugal pump has to work
Correct : A. Right
16. The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
Correct : B. 50%
17. A reciprocating pump is also called a
Correct : A. positive
18. Which of the following statement is correct?
Correct : C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure
19. If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
Correct : A. geometric similarity
20. If the ratios of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
Correct : C. dynamic similarity
21. Which of the following pump is sucessfully used for lifting water to the turbines?
Correct : C. Jet pump
22. A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
Correct : C. manometric head
23. In a Francis turbine, the pressure at inlet is
Correct : B. more than
24. The maximum number of jets, generally, employed in an impulse turbine without jet interference are
Correct : C. six
25. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
Correct : C. Hydraulic torque converter
26. The head available at the inlet of the turbine is known as net or effective head.
Correct : A. Correct
27. A double overhung Pelton wheel has
Correct : B. two runners
28. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
Correct : A. Agree
29. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
Correct : D. high speed with mixed flow at outlet
30. Discharge of a centrifugal pump is
Correct : D. inversely proportional to (diameter)2 of its impeller
31. In an outward flow reaction turbine
Correct : B. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
32. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
Correct : B. Francis turbine
33. The Thomson's turbine is
Correct : C. an outward flow
34. The power of a centrifugal pump working under constant head and discharge increases with the speed.
Correct : A. True
35. A reciprocating pump is suitable for less discharge and higher heads.
Correct : A. True
36. The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.
Correct : A. True
37. The speed ratio in case of Francis turbine varies from
Correct : C. 0.6 to 0.9
38. Multi-stage centrifugal pumps are used to
Correct : B. produce high heads
39. If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Correct : A. Agree
40. The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is