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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Double
Eight times
Four times
Sixteen times

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Hydraulics and Fluid Mechanics in ME
Which of the following is dimensionless?

Specific gravity
Specific speed
Specific volume
Specific weight

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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)

0.20 cm
0.10 cm
0.05 cm
0.40 cm

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Hydraulics and Fluid Mechanics in ME
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

Necessity of air vessel
Lower discharge
Lower speed of operation
High initial and maintenance cost

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Hydraulics and Fluid Mechanics in ME
The viscosity of water at 20°C is

One centipoise
One centistoke
One stoke
One poise

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant pressure, the speed capacity and power vary

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

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