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Fluid Mechanics

Fluid Mechanics
Which of the following produces maximum pressure difference for transportation of gases?

Vaccum pumps
Compressors
Blowers
Fans

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Fluid Mechanics
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)

d2
√d
d1/3
d2/3

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Fluid Mechanics
The Mach number for hypersonic flow of compressible fluid is

1
> 4
< 2
> 1

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Fluid Mechanics
Foot valves are provided in the suction line of a centrifugal pump to

Remove the contaminant present in the liquid
Avoid priming, every time we start the pump
Control the liquid discharge
Minimise the fluctuation in discharge

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Fluid Mechanics
The value of critical Reynolds number for pipe flow is

1300
10000
100000
None of these

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Fluid Mechanics
If the head over the triangular notch is doubled, the discharge will increase by __________ times.

4
5.657
2
2.828

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