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Hydraulics and Fluid Mechanics in ME

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

Eight times
Four times
Sixteen times
Double

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Hydraulics and Fluid Mechanics in ME
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

(q/g)1/2
(q²/g)1/3
(q⁴/g)1/5
(q³/g)1/4

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Hydraulics and Fluid Mechanics in ME
The motion of air mass in a tornado is a

free vortex motion
forced vortex at center and free vortex outside
forced vortex motion
free vortex at center and forced vortex outside

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Hydraulics and Fluid Mechanics in ME
A hydraulic coupling belongs to the category of

Energy transfer machines
Power developing machines
Energy generating machines
Power absorbing machines

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Hydraulics and Fluid Mechanics in ME
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as ________ efficiency.

None of these
Overall
Mechanical
Hydraulic

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Hydraulics and Fluid Mechanics in ME
The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

(2 L.A.N)/60
L.A.N
(L.A.N)/60
2 L.A.N

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