Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

71. The difference of head as shown by manometers connected between the inlet and outlet flanges of the pump is known as

  1. Static head
  2. Manometric head
  3. Total head
  4. Dynamic head
Answer
Answer. b

72. Two identical pumps operating in parallel

  1. boosts the discharge
  2. boosts the head
  3. boosts both the discharge and head
  4. delivers same discharge and head that of single pump
Answer
Answer. a

73. The cavitation parameter σ is defined in terms of net positive suction head (NPSH) and net head H as

  1. NPSH/√H
  2. H/NPSH
  3. H/√NPSH
  4. NPSH/H
Answer
Answer. d

74. The work saved by fitting an air vessel to a single acting reciprocating pump is

  1. 89.4%
  2. 39.2%
  3. 92.3%
  4. 48.8%
Answer
Answer. a

75. A minimum Net Positive Suction Head (NPSH) is required for a hydraulic pump to

  1. increase the delivery head
  2. increase the suction head
  3. prevent the cavitation
  4. increase the efficiency
Answer
Answer. c

76. Reciprocating pumps are suitable for

  1. low discharge and high head
  2. high discharge and low head
  3. low discharge and low head
  4. high discharge and high head
Answer
Answer. a

77. If two pumps identical in all respects and each capable of delivering a discharge ‘Q’ against a head H are connected in parallel, the resulting discharge is

  1. 2Q against a head 2H
  2. 2Q against a head H
  3. Q against a head 2H
  4. Q against a head H
Answer
Answer. b

78. The suction lift of a water supply pump is equal

  1. length of suction pipe
  2. height of pump above water level of storage reservoir
  3. the vacuum pressure head
  4. the atmospheric pressure head less various hydraulic losses
Answer
Answer. b

79. A uniform rate of pumping is required in

  1. gravity system
  2. balanced system
  3. pumping and storage system
  4. all of the above
Answer
Answer. b

80. A valve provided immediately above the pump to reduce back surge and water hammer is called

  1. spring valve
  2. sluice valve
  3. reflux valve
  4. spindle valve
Answer
Answer. c
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