Fluid Mechanics
Net positive suction head (NPSH) of a centrifugal pump must be

Greater than the vapour pressure of the liquid
Less than the vapour pressure of the liquid
Equal to the vapour pressure of the liquid
Less than barometric pressure

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Fluid Mechanics
A differential pressure cell is used for

Measuring small pressure difference in liquids
Remote recording of pressure difference
Measuring small pressure difference in gases
Measuring the difference of the impact & the static pressure

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