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Hydraulics and Fluid Mechanics in ME

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

less than 4000
more than 4000
less than 2000
between 2000 and 4000

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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 above
Ax̅ / IG above
IG / Ax̅ below

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Hydraulics and Fluid Mechanics in ME
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

metacentre
center of buoyancy
center of gravity
center of pressure

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant pressure, the speed capacity and power vary

Directly as the air or gas density
Inversely as density
Inversely as square root of density
As square of density

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

Speed
Both (A) and (B) above
Fluid density
Impeller diameter

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Hydraulics and Fluid Mechanics in ME
The speed of a turbine runner is

Inversely proportional to H3/2
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2

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