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FLUID MECHANICS

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

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

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Fluid Mechanics
While starting an axial flow pump, its delivery valve should be kept

Either open or closed
Open
Closed
None of these

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Fluid Mechanics
Pressure drag does not depend upon the

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

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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/2
x
2x
πx

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Fluid Mechanics
Which of the following is the most common pump for pumping either raw sewage or sludge?

Centrifugal pump
Gear pump
Reciprocating pump
Electromagnetic pump

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