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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.

One-third
Two-third
Equal to
Three-fourth

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Hydraulics and Fluid Mechanics in ME
The tendency of a liquid surface to contract is due to the following property

adhesion
cohesion
surface tension
viscosity

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Hydraulics and Fluid Mechanics in ME
Resultant pressure of the liquid in the case of an immersed body acts through

Metacentre
Centre of buoyancy
Centre of pressure
Centre of gravity

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

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

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Hydraulics and Fluid Mechanics in ME
The equation of continuity holds good when the flow

is steady
velocity is uniform at all the cross sec-tions
is one dimensional
All of these

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

Square of fan speed
Directly as fan speed
Square root of fan speed
Cube of fan speed

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