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Fluid Mechanics

Fluid Mechanics
Unit of mass velocity is

Kg/m³. hr
Kg/m². hr
Kg/hr
Kg/m²

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Fluid Mechanics
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

Increase
Remain unchanged
Decrease
Data insufficient to predict relative pressure drop

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

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

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

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

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Fluid Mechanics
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.

Transition
Prandtl mixing
Equivalent
None of these

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Fluid Mechanics
Bernoulli's equation is not applicable, when the flow is

Irrotational
All of these
Viscous
Incompressible

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