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Fluid Mechanics

Fluid Mechanics
Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.

70
10
1
40

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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.

1
20090
5.5
20363

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Fluid Mechanics
The equivalent diameter for flow through a rectangular duct of width B and height H is

2HB/(H + B)
HB/(H + B)
HB/2(H + B)
4HB/(H + B)

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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
πx
2x

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Fluid Mechanics
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

Decreases linearly with V
Decreases as V²
None of these
Increases linearly with V

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Fluid Mechanics
Purpose of relief valve in a reciprocating pump is to

Control the rate of discharge
Facilitate unidirectional flow of liquid
Reduce the discharge pressure
Protect the pump against developing excessive pressure

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