Question 1 : Which of the following pump is successfully used for lifting water to the turbines?
1. Centrifugal pump
2. Reciprocating pump
3. Jet pump
4. Air lift pump
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Question 2 : If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
1. excessive power will be consumed
2. efficiency will be low
3. cavitation will be formed
4. no flow will take place
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Question 3 : A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
1. 245 r.p.m.
2. 215.5 r.p.m.
3. 175.4 r.p.m.
4. 275.4 r.p.m
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Question 4 : The runaway speed of a hydraulic turbine is the speed
1. at which there will be no damage to the runner
2. at which the turbine will run freely without load
3. corresponding to maximum overload permissible
4. at full load
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Question 5 : The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
1. slow speed pump with radial flow at outlet
2. medium speed pump with radial flow at outlet
3. high speed pump with radial flow at outlet
4. high speed pump with axial flow at outlet
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Question 6 : In a centrifugal pump, the regulating valve is provided on the
1. casing
2. impeller
3. delivery pipe
4. suction pipe
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Question 7 : The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
1. delivers unit discharge under unit speed
2. develops unit power under unit speed
3. delivers unit discharge under unit head
4. develops unit power under unit head
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Question 8 : Mechanical efficiency of a centrifugal pump is the ratio of
1. energy available at the impeller to the energy supplied to the pump by the prime mover
2. manometric head to the energy supplied by the impeller per kN of water
3. actual workdone by the pump to the energy supplied to the pump by the prime mover
4. energy supplied to the pump to the energy available at the impeller
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Question 9 : The cavitation in a hydraulic machine is mainly due to
1. low velocity
2. high velocity
3. low pressure
4. high pressure
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Question 10 : Which of the following statement is correct ?
1. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure.
2. In a reaction turbine, the water glides over the moving vanes with kinetic energy.
3. In an impulse turbine, the water impinges on the buckets with pressure energy.
4. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes.
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