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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

equal
more
less
less at low temperature and more at high temperature

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Hydraulics and Fluid Mechanics in ME
The force of buoyancy is always __________ the weight of the liquid displaced by the body.

Less than
Equal to
More than
None of these

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × sloping side
1/2 × breadth
1/4 × (depth + breadth)
1/2 × depth

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Hydraulics and Fluid Mechanics in ME
Principle of similitude forms the basis of

designing models so that the result can be converted to prototypes
comparing two identical equipments
comparing similarity between design and actual equipment
hydraulic designs

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Hydraulics and Fluid Mechanics in ME
The time oscillation of a floating body with increase in meatcentric height will be

Same
Lower
Higher
Lower/higher depending on weight of body

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Hydraulics and Fluid Mechanics in ME
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

64/ Re
32/ Re
None of these
16/Re

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