Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

81. Impeller for sewage pumps is

  1. shrouded impeller
  2. open impeller
  3. ring impeller
  4. none of the above
Answer
Answer. d

82. The efficiency of a pumping set is generally assumed to be

  1. 65% to 70%
  2. 55% to 60%
  3. 75% to 80%
  4. 85% to 90%
Answer
Answer. a

83. The most widely used pump for lifting sewage is

  1. reciprocating pump
  2. centrifugal pump
  3. air pressure pump
  4. none of the above
Answer
Answer. b

84. A hand pump is a type of

  1. Centrifugal pump
  2. Reciprocating pump
  3. Rotary pump
  4. Jet pump
Answer
Answer. b

85. Hand pump operates through

  1. Electric motor
  2. Solar energy
  3. One way valve
  4. Rotating vane
Answer
Answer. c

86. Discharge through a single acting reciprocating pump is

  1. Q = ALN/60
  2. Q= ALN
  3. Q = 2ALM/60
  4. Q=2ALN
Answer
Answer. a

87. The valve used to control as vertical cylinder to prevent it from descending due to external load is

  1. Pressure relief valve
  2. Counterbalance valve
  3. Pressure compensated valve
  4. Directional control valve
Answer
Answer. b

88. The cavitation in a hydraulic machine is mainly due to

  1. High velocity
  2. Low velocity
  3. High pressure
  4. Low pressure
Answer
Answer. d

89. A single-acting reciprocating pump, running at 50 rpm delivers 0.01 m3/s of water. The diameter of the piston is 200 mm and the stroke length is 400 mm. The theoretical discharge of the pump is

  1. 10.5 l/s
  2. 14.0 l/s
  3. 17.5 l/s
  4. 21.0 l/s
Answer
Answer. a

90. A pressure-relief valve has a pressure setting of 200 bar. The power loss across the valve if all pump flow of 120 L/min flows back to the reservoir is

  1. 40 W
  2. 40 kW
  3. 400 kW
  4. 1000 kW
Answer
Answer. b
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