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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The highest efficiency is obtained with a channel of __________ section.

Trapezoidal
Rectangular
Circular
Square

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Hydraulics and Fluid Mechanics in ME
According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)

C × √(m × i)
A × √(m × i)
AC × √(m × i)
mi × √(A × C)

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

Double
Three-fourth
One-half
One-fourth

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Hydraulics and Fluid Mechanics in ME
In an immersed body, center of pressure is

could be above or below e.g. depending on density of body and liquid
below be center of gravity
above the center of gravity
at the center of gravity

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for the fans having constant wheel diameters, the power demand varies

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

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Hydraulics and Fluid Mechanics in ME
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

2700
10000
21000
2100

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