Question 61 : The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
1. normal speed
2. specific speed
3. none of these
4. unit speed
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Question 62 : Manometric head, in case of a centrifugal pump, is equal to
1. Workdone per kN of water - Losses within the impeller
2. all of the above
3. Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
4. Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
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Question 63 : A hydraulic coupling belongs to the category of
1. power developing machines
2. energy generating machines
3. energy transfer machines
4. power absorbing machines
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Question 64 : The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
1. high speed with radial flow at outlet
2. high speed with axial flow at outlet
3. medium speed with radial flow at outlet
4. slow speed with radial flow at outlet
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Question 65 : The maximum number of jets, generally, employed in an impulse turbine without jet interference are
1. 6
2. 2
3. 7
4. 5
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Question 66 : For centrifugal pump impeller, the maximum value of the vane exit angle is
1. 25° to 30°
2. 20° to 25°
3. 10° to 15°
4. 15° to 20°
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Question 67 : Which of the following turbine is preferred for 0 to 25 m head of water?
1. Kaplan turbine
2. none of these
3. Pelton wheel
4. Francis turbine
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Question 68 : A Francis turbine is used when the available head of water is
1. 25 m to 250 m
2. 0 to 25 m
3. above 250 m
4. none of these
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Question 69 : The overall efficiency of a reaction turbine is the ratio of
1. actual work available at the turbine to the energy imparted to the wheel
2. none of the above
3. power produced by the turbine to the energy actually supplied by the turbine
4. workdone on the wheel to the energy (or head of water) actually supplied to the turbine
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Question 70 : Slip of a reciprocating pump is defined as the
1. difference of theoretical discharge and the actual discharge
2. product of theoretical discharge and the actual discharge
3. ratio of actual discharge to the theoretical discharge
4. sum of actual discharge and the theoretical discharge
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