Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is

Directly proportional to (diameter)² of its impeller
Directly proportional to diameter of its impeller
Inversely proportional to diameter of its impeller
Inversely proportional to (diameter)² of its impeller

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Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Energy available at the impeller to the energy supplied to the pump by the prime mover
Manometric head to the energy supplied by the impeller per kN of water
Energy supplied to the pump to the energy available at the impeller
Actual work-done by the pump to the energy supplied to the pump by the prime mover

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
None of these

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Hydraulics and Fluid Mechanics in ME
The hammer blow in pipes occurs when

The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
There is excessive leakage in the pipe
The flow of fluid through the pipe is gradually brought to rest by closing of the valve
The pipe bursts under high pressure of fluid

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