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Fluid Mechanics

Fluid Mechanics
Momentum transfer in laminar flow of fluids results due to the

Density
Viscosity
None of these
Velocity gradient

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Fluid Mechanics
Priming of a centrifugal pump is done to

Develop effective pressure rise by the pump
Increase the mass flow rate of fluid
Avoid chances of separation inside the impeller
None of these

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Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

2Δp
Δp²
Δp
Δp/2

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Fluid Mechanics
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

10 m
20 m
11 m
12 m

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Fluid Mechanics
Bernoull's equation does not apply to the functioning of a/an

Orificem
Venturimeter
Pitot tube
None of these

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Fluid Mechanics
While starting a centrifugal pump, its delivery valve should be kept

Closed
Either opened or closed; depending on the fluid viscosity
Either opened or closed ; it does not make any difference
Opened

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