Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

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

1. Centrifugal pumps
2. Reciprocating pumps
3. Mixed flow pumps
4. Axial flow pumps

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

1. Diameter of its impeller
2. Square of diameter of its impeller
3. Cube of diameter of its impeller
4. Fourth power of diameter of its impeller

33. Multi-stage centrifugal pumps are used to

1. Give high discharge
2. Produce high heads
3. Pump viscous fluids
4. All of these

34. High lift multi-stage centrifugal pumps work against a head of

1. 15-20 m
2. < 15 m
3. > 40 m
4. 20-40 m

35. Which of the given preference is beneficial for attaining a non-overloading characteristic in a centrifugal pump?

1. Backward bent vanes are preferred over forward bent vanes
2. Forward bent vanes are preferred over backward bent vanes
3. Forward bent vanes are preferred over vanes radial at outlet
4. Vanes radial at outlet are preferred over backward vanes

36. A 15 kW centrifugal pump working at 75% efficiency, is pumping a liquid of unit weight 10000 N/m³ through an additional head of 10 m, what is the discharge in m³/s?

1. 0.1125
2. 0.1500
3. 0.1250
4. 0.1000

37. As compared to reciprocating pumps, the discharging capacity of a centrifugal pump is more whereas its pressure head will be

1. Too much
2. Same as that of reciprocating pumps
3. Less as compared to reciprocating pumps
4. Too less

38. The ratio of the power at the impeller to the power at the shaft is known as

1. manometric efficiency
2. mechanical efficiency
3. overall efficiency
4. efficiency of pump

39. The overall efficiency of hydraulic pump (η_o) is given by

1. Shaft power/Water power
2. Shaft power × Water power
3. Water power × Shaft power
4. Water power/Shaft power

40. What is the disadvantage of centrifugal pump compared with reciprocating pump?

1. priming required
2. pulsatory flow
3. low speed
4. difficult to handle viscous fluid