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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The value of coefficient of discharge is __________ the value of coefficient of velocity.

More than
Less than
None of these
Same as

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Hydraulics and Fluid Mechanics in ME
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

ρ ω2 r2/2
2ρ ω2 r2
ρ ω2 r2
ρ ω2 r2/4

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Hydraulics and Fluid Mechanics in ME
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

0.3
0.6
0.83
0.4

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Hydraulics and Fluid Mechanics in ME
Air vessels in reciprocating pump are used to

Smoothen flow
Reduce acceleration to minimum
Save pump from cavitations
Increase pump efficiency

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

Less than 2000
More than 4000
Less than 4000
Between 2000 and 4000

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Hydraulics and Fluid Mechanics in ME
The units of dynamic or absolute viscosity are

newton-sec² per meter
newton-sec per meter
metres² per sec
kg sec/meter

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