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Fluid Mechanics

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

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

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Fluid Mechanics
Unsteady non-uniform flow is represented by flow through a/an

Long pipe at constant rate
Expanding tube at increasing rate
Expanding tube at constant rate
Long pipe at decreasing rate

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Fluid Mechanics
The most economical flow control valve for use with large diameter pipes is a

Needle valve
Globe valve
None of these
Butterfly valve

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Fluid Mechanics
A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now

Decrease
Data insufficient to predict
Increase
Remain same

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Fluid Mechanics
Slurries can be most conveniently pumped by a __________ pump.

Gear
Screw
Centrifugal
Reciprocating

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Fluid Mechanics
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

> 1
2
1
< 1

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