Fluid Mechanics
Purpose of relief valve in a reciprocating pump is to

Facilitate unidirectional flow of liquid
Reduce the discharge pressure
Control the rate of discharge
Protect the pump against developing excessive pressure

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Fluid Mechanics
The continuity equation

Stipulates that Newton's second law of motion must be satisfied at every point in the fluid
Relates mass flow rate along a stream tube
Relates work and energy
None of these

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