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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A flow is called sub-sonic, if the Mach number is

More than 6
Less than unity
Between 1 and 6
Unity

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

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Hydraulics and Fluid Mechanics in ME
The atmospheric pressure with rise in altitude decreases

linearly
first slowly and then steeply
first steeply and then gradually
unpredictable

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Hydraulics and Fluid Mechanics in ME
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A × M × m2/3 × i1/2
A × M × m1/2 × i2/3
A2/3 × M1/3 × m × i
A1/2 × M2/3 × m × i

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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

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

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Hydraulics and Fluid Mechanics in ME
A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be

1.5 m/sec
1 m/sec
2 m/sec
less than 1 m/sec

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