Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

21. In a hydraulic machine, the moment of momentum of water is reduced by 15915 N.m, when the machine is rotating at 600 rpm. The power developed is

  1. 1500 kW
  2. 1000 kW
  3. 2500 kW
  4. 2000 kW
Answer
Answer. b

22. Consider the following data relating to the performance of a centrifugal pump:

speed = 1200 rpm, flow rate = 30 l/s, head = 20 m, and power = 5 kW. If the speed of the pump is increased to 1500 rpm, assuming the efficiency is unaltered, the new flow rate and head, respectively, will be

  1. 46.9 l/s and 25.0 m
  2. 37.5 l/s and 25.0 m
  3. 46.9 l/s and 31.3 m
  4. 37.5 /s and 31.3 m
Answer
Answer. d

23. Two identical centrifugal pumps are connected in parallel to a common delivery pipe of a system. The discharge performance curve of each of the pumps is represented by H = 30 – 80Q2. The discharge head equation of the parallel duplex pump set is

  1. H = 30 – 80Q2
  2. H = 15 – 20Q2
  3. H = 30 – 20Q2
  4. H = 15 – 80Q2
Answer
Answer. c

24. Type of pump preferred for very high discharge at low pressure such as for control and irrigation is

  1. Reciprocating
  2. Mixed flow
  3. Axial flow
  4. Centrifugal
Answer
Answer. c

25. Classification of Centrifugal pump is normally on the basis of is

  1. impeller blade angle
  2. rpm
  3. type of casing
  4. number of blades in impeller
Answer
Answer. c

26. The overall efficiency of a pump is obtained by which of the following equations with usual notations?

  1. ηo = ηman × ηmech
  2. ηo = ηhy × ηmech
  3. ηo = ηman × ηhy
  4. ηo = ηvol × ηmin
Answer
Answer. a and b

27. A fast centrifugal pump impeller has which of following?

  1. Foward facing blades
  2. Radial blades
  3. Backward facing blades
  4. Propeller types blades
Answer
Answer. c

28. In a centrifugal pump the regulating valve is provided on the

  1. Casing
  2. Delivery pipe
  3. Suction pipe
  4. Impeller
Answer
Answer. b

29. Most commonly used pump for lifting water in water supply mains, is

  1. Reciprocating pump
  2. Axial flow pump
  3. Centrifugal pumps
  4. Rotary type pump
Answer
Answer. b

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

  1. Slow speed with radial flow at outlet
  2. Medium speed with radial flow at outlet
  3. High speed with mixed flow at outlet
  4. High speed with radial flow at outlet
Answer
Answer. c
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