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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Roynolds 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
Bernoulli equation deals with the law of conservation of

momentum
work
mass
energy

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the pressure varies

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

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Hydraulics and Fluid Mechanics in ME
Euler's number is the ratio of __________ force to pressure force.

Inertia
Gravity
None of these
Viscous

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Hydraulics and Fluid Mechanics in ME
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

μ π³ N² R² /3600 t
μ π³ N² R⁴ /1800 t
μ π³ N² R⁴ /3600 t
μ π³ N² R² /1800 t

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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.

Two-third
Three-fourth
Equal to
One-third

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