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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The flow in a pipe is neither laminar nor turbulent when Reynold number is

More than 2800
None of these
Between 2000 and 2800
Less than 2000

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Hydraulics and Fluid Mechanics in ME
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

None of these
ηm = ηm × ηh
ηh = ηo × ηm
ηo = ηh × ηm

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

As square of density
Inversely as density
Inversely as square root of density
Directly as the air or gas density

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Hydraulics and Fluid Mechanics in ME
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

IG / Ax̅ above
Ax̅ / IG below
Ax̅ / IG above
IG / Ax̅ below

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Hydraulics and Fluid Mechanics in ME
The atmospheric pressure at sea level is

760 mm of mercury
10.3 m of water
103 kN/m2
All of these

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Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

None of these
Equal to
Inversely proportional
Directly proportional

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