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Fluid Mechanics

Fluid Mechanics
Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

0.1
1
0.01
0.001

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Fluid Mechanics
The unit of velocity head is

ft-lbf/lb
ft-lb/ft³
ft-lb/sec
ft-lbf/sec

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Fluid Mechanics
The temperature in isentropic flow

None of these
Depends on Mach number only
Does not depend on Mach number
Cannot drop and then increase again downstream

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Fluid Mechanics
Two dimensional stream function

None of these
Is constant along an equipotential surface
Is constant along a stream line
Relates velocity and pressure

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Fluid Mechanics
Which of the following is used for very accurate measurement of flow of gas at low velocity?

Pitot tube
Segmental orificemeter
Rotameter
Hot wire annemometer

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Fluid Mechanics
The unit of dynamic viscosity in SI unit is

m/N. sec
m² /sec
N/m²
kg/m . sec

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