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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

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

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Hydraulics and Fluid Mechanics in ME
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

0.40 cm
0.05 cm
0.10 cm
0.20 cm

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Hydraulics and Fluid Mechanics in ME
The speed of a turbine runner is

Directly proportional to H1/2
Inversely proportional to H3/2
Inversely proportional to H1/2
Directly proportional to H3/2

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Hydraulics and Fluid Mechanics in ME
Centre of pressure compared to e.g. is

above or below depending on area of body
above it
at same point
below it

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Hydraulics and Fluid Mechanics in ME
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to

0.001
0.1
0.01
0.0001

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Hydraulics and Fluid Mechanics in ME
In order to avoid cavitation in centrifugal pumps

The delivery pressure should be low
The delivery pressure should be high
The suction pressure should be low
The suction pressure should be high

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