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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

Ax̅ / IG below
IG / Ax̅ below
Ax̅ / IG above
IG / Ax̅ above

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Cavitation will be formed
No flow will take place
Efficiency will be low
Excessive power will be consumed

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Hydraulics and Fluid Mechanics in ME
Falling drops of water become spheres due to the property of

adhesion
cohesion
surface tension
viscosity

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Hydraulics and Fluid Mechanics in ME
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

None of these
Remain same
Increases
Decreases

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Hydraulics and Fluid Mechanics in ME
Stream lines and path lines always coincide in case of

turbulent flow
laminar flow
uniform flow
steady flow

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Hydraulics and Fluid Mechanics in ME
The flow in a pipe is turbulent when Reynold number is

Between 2000 and 2800
Less than 2000
More than 2800
None of these

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