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

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
Energy available at the impeller to the energy supplied to the pump by the prime mover

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Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Length of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Diameter of both the pipes is same
Loss of head and discharge of both the pipes is same

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Hydraulics and Fluid Mechanics in ME
Buoyant force is

Equal to the volume of liquid displaced
The resultant force acting on a floating body
The force necessary to maintain equilibrium of a submerged body
The resultant force on a body due to the fluid surrounding it

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