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Fluid Mechanics

Fluid Mechanics
A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

20363
1
5.5
20090

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Fluid Mechanics
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).

24
24000
0.44
0.24

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

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

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Fluid Mechanics
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

R and S
P and R
P, Q and R
P, Rand S

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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
Reduce the discharge pressure
Facilitate unidirectional flow of liquid

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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

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

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