Hydraulic Machines Multiple Choice Questions and Answers

61. In a centrifugal pump, the liquid enters the pump

1. At the centre
2. At the bottom
3. At the top
4. From sides

62. A turbine pump is basically a centrifugal pump equipped additionally with

1. adjustable blades
2. backward curved blades
3. vaned diffusion casing
4. inlet guide blades

63. Hydraulic accumulator is used for

1. accumulating oil
2. supplying large quantities of oil for very short duration
3. generally high pressures to operate hydraulic machines
4. supplying energy when main supply fails

64. Francis turbine is

1. A reaction radial flow turbine
2. An axial flow turbine
3. A radial flow turbine
4. An impulse turbine

65. One horsepower is equal to

1. 102 watts
2. 75 watts
3. 550 watts
4. 735 watts

66. The optimum value of vane exit angle for a centrifugal pump impeller is

1. 10-15 degree
2. 20-25 degree
3. 30-40 degree
4. 50-60 degree

67. Specific speed for reaction turbines ranges from

1. 0 to 4.5
2. 10 to 100
3. 80 to 200
4. 250 to 300

68. The maximum number of jets generally employed in impulse turbine without jet interference is

1. 4
2. 6
3. 8
4. 12

69. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

1. 39.20%
2. 49.20%
3. 68.80%
4. 84.80%

70. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

1. 39.20%
2. 49.20%
3. 68.80%
4. 84.80%