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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
Double
Four times
Sixteen times

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Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Reynolds number is

Less than 2000
Between 2000 and 4000
More than 4000
Less than 4000

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Hydraulics and Fluid Mechanics in ME
A differential manometer is used to measure

Difference of pressures between two points in a pipe
Pressure in Venturimeter
Atmospheric pressure
Pressure in pipes and channels

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Hydraulics and Fluid Mechanics in ME
The angle of contact in case of a liquid depends upon

the material which exists above the free surface of the liquid
both of die above
any one of the above
the nature of the liquid and the solid

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Hydraulics and Fluid Mechanics in ME
When the Mach number is less than unity, the flow is called

Hyper-sonic flow
Sonic flow
Sub-sonic flow
Super-sonic flow

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Hydraulics and Fluid Mechanics in ME
The Reynold's number of a ship is __________ to its velocity and length.

Square root of velocity
None of these
Directly proportional
Inversely proportional

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