Hydraulic Pumps MCQ | Centrifugal Pumps MCQ

61. The theoretical power required to drive a reciprocal pump is

1. wQH_s/60
2. wQH_s/75
3. wQH_d/60
4. 270/π

62. Which of the following pumps is preferred for flood control and irrigation applications?

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

63. Net positive suction head is

1. pressure head + kinetic head
2. pressure head + vapour pressure + kinetic head
3. pressure head – vapour pressure + kinetic head
4. pressure head – vapour pressure – kinetic head Produced

64. If two pumps identical in all respects and each capable of delivering a discharge Q against a head H are connected in series, the following discharge is

1. 2Q against a head of 2H
2. 2Q against a head of H
3. Q against a head of 2H
4. Q^0.5 against a head of H^0.5

65. Pumps are connected in parallel to increase the

1. velocity head
2. pressure head
3. total head
4. discharge

66. A hydraulic ram is a device used to

1. Store the energy of water
2. Increase the pressure of water
3. To lift water from deep wells
4. To lift small quantity of water to a greater height when a large quantity of a water is available at a smaller height

67. The flow direction to and fro from double acting cylinder is typically controlled by a

1. 1 way DCV valve
2. 2 way DCV valve
3. 3 way DCV valve
4. 4 way DCV valve

68. For a single acting reciprocating pump, if theoretical and actual discharges are 5.6 liters/second and 4.6 liters/second respectively, then slip for pump would approximately be

1. 9.9 %
2. 14.3%
3. 17.8%
4. None of the above

69. The specific speed of a pump has the dimensions of

1. L^3/4T^3/2
2. M⁰L⁰T⁰
3. M^-1/2L^1/2T^-1/4
4. L^3/4T^-1/2

70. Discharge of a double acting reciprocating pump is

1. 2LAN
2. LAN
3. LAN/60
4. 2LAN/60