## 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

## 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

## Fluid Mechanics Pressure drag does not depend upon the

Pressure of main flow only
All of these
Roughness of surface of the body
Length of the body in flow direction

## Fluid Mechanics Which of the following is used for very accurate measurement of flow of gas at low velocity?

Pitot tube
Hot wire annemometer
Segmental orificemeter
Rotameter

## Fluid Mechanics For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

V/Vmax = (r/x)1/7
None of these
V/Vmax = (x/r)1/7
V/Vmax = (x.r)1/7

## Fluid Mechanics A hydraulic ram acts as a/an __________ pump.

Parallel cylinder
Reciprocating
Impulse
Centrifugal