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Fluid Mechanics

Fluid Mechanics
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

D
Σ
1/d
L/σ

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Fluid Mechanics
Plunger pumps are used for

None of these
Viscous mass
Slurries
Higher pressure

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

None of these
Velocity gradient
Density
Viscosity

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Fluid Mechanics
Boundary layer separation occurs when the

Cross-section of the channel is reduced
Valve is closed in a pipeline
Pressure reaches a minimum
Velocity of sound is reached

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Fluid Mechanics
The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)

x
x/2
2x
πx

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Fluid Mechanics
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

Pipe length
All of these
Fluid velocity in the pipe
Time taken to close the valve

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