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Fluid Mechanics

Fluid Mechanics
Cd is always __________ Cc.

Either more or less than
Less than
Greater than
Equal to

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Fluid Mechanics
Transition from laminar flow to turbulent flow is aided by the

Vibration
Pressure gradient and the compressibility of the flowing medium
All of these
Surface roughness and curvature (i.e.sharp corners)

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Fluid Mechanics
Reciprocating pumps compared to centrifugal pumps

Are not subject to air binding
Can be operated with delivery valve closed
Deliver liquid at uniform pressure
Can handle slurries more efficiently

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Fluid Mechanics
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will

Remain same
Unpredictable
Increase
Decrease

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Fluid Mechanics
Which of the following is not a dimension-less parameter?

Fanning friction factor
None of these
Euler number
Specific gravity

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

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

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