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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Rain drops are spherical because of

viscosity
surface tension forces
air resistance
atmospheric pressure

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Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

All of the listed here
Cohesion of the liquid
Adhesion of the liquid molecules and the molecules on the surface of a solid
Surface tension

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Hydraulics and Fluid Mechanics in ME
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r³/4g
π w ω² r⁴/4g
π w ω² r²/2g
π w ω² r²/4g

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Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.75 to 0.85
0.65 to 0.75
0.85 to 0.90
0.50 to 0.65

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Hydraulics and Fluid Mechanics in ME
Head developed by a centrifugal pump is

Proportional to diameter and speed of impeller
None of these
Proportional to speed of impeller
Proportional to diameter of impeller

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

0.95 times
0.34 times
0.81 times
0.67 times

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