Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

41. If the pump head is 75 m, discharge is 0.464 m3/s and the motor speed is 1440 rpm at rated condition, the specific speed of the pump is about

  1. 1440
  2. 38
  3. 26
  4. 4
Answer
Answer. b

42. When two identical centrifugal pumps are operating in series on common rising main, then?

  1. The pressure in the rising main will be nearly doubled, while discharge will remains same
  2. The discharge will be nearly doubled while the pressure remains the same
  3. Discharge as well as the pressure in the rising main will be doubled
  4. Discharge as well as the pressure in the rising main will increase but not become double
Answer
Answer. a

43. Which of the following pumps is suitable for small discharge and high head?

  1. Centrifugal pump
  2. Axial flow pump
  3. Mixed flow pump
  4. Reciprocating pump
Answer
Answer. d

44. For a centrifugal pump, suction lift head is the

  1. Vertical distance between the top surface of liquid level in the discharge tank and pump centre line
  2. Vertical distance between free surface of liquid level in the sump and pump centre line
  3. Head for overcoming friction loss in the suction pipe, entry loss at entrance to the friction pipe and running fluid in the suction pipe
  4. None of the above
Answer
Answer. b

45. The manometer head (Hm) of a centrifugal pump is given by

  1. Pressure head at outlet of pump – pressure head at inlet
  2. Total head at inlet × total head at outlet
  3. Total head at outlet – total head at inlet
  4. None of the above
Answer
Answer. c

46. To produce a high head multi-stage centrifugal pumps, the impellers are connected

  1. in parallel
  2. in series
  3. in parallel and in series both
  4. none of the above
Answer
Answer. b

47. A double-acting reciprocating pump having piston area 0.1 m2 has a stroke 0.30 m long. The pump is discharging 2.4 m3 of water per minute at 45 rpm through a height of 10 m. The slip of the pump and power required to drive the pump will be nearly

  1. 0.005 m3/s and 4.8 kW
  2. 0.003 m3/s and 4.8 kW
  3. 0.005 m3/s and 4.4 kW
  4. 0.003 m3/s and 4.4 kW
Answer
Answer. c

48. In a single acting reciprocating pump, water is delivered in

  1. Suction stroke
  2. Delivery stroke
  3. Middle of suction stroke
  4. Middle of delivery stroke
Answer
Answer. b

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

  1. Smoothen the flow
  2. Reduce suction head
  3. Increase delivery head
  4. Reduce acceleration head
Answer
Answer. a

50. A double acting duplex reciprocating pump has

  1. 4 pistons
  2. 4 cylinders
  3. 2 pistons
  4. 1 piston
Answer
Answer. c
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