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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
According to fan laws, for the fans having constant wheel diameters, the power demand varies

Square of fan speed
Cube of fan speed
Square root of fan speed
Directly as fan speed

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Hydraulics and Fluid Mechanics in ME
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

40 × 10⁶ kg/cm²
400 kg/cm²
40 × 10⁵ kg/cm²
4000 kg/cm²

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Hydraulics and Fluid Mechanics in ME
The viscosity of a gas

increases with increase in temperature
decreases with increase in temperature
is independent of temperature
is independent of pressure for very high pressure intensities

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Hydraulics and Fluid Mechanics in ME
The Francis formula for the discharge over Cipoletti weir is

1.84 LH5/2
1.84 LH3/2
1.84 LH1/2
1.84 LH

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Hydraulics and Fluid Mechanics in ME
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

wh
h/w
w/h
h

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Hydraulics and Fluid Mechanics in ME
The Newton's law of resistance is based on the assumption that the

Planes of the body are completely smooth
Space around the body is completely filled with the fluid
All of these
Fluid particles do not exert any influence on one another

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