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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the Mach number is more than 6, the flow is called

Sonic flow
Hyper-sonic flow
Sub-sonic flow
Super-sonic flow

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Hydraulics and Fluid Mechanics in ME
An ideal flow of any fluid must fulfill the following

Newton’s law of viscosity
Continuity equation
Pascal’ law
Newton’s law of motion

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Hydraulics and Fluid Mechanics in ME
The cavitation in a hydraulic machine

Reduces the discharge of a turbine
Causes noise and vibration of various parts
All of these
Causes sudden drop in power output and efficiency

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

0.95 times
0.81 times
0.34 times
0.67 times

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

Rectangular
Circular
Square
Trapezoidal

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

Cc × Cr
Cc × Cv
Cv × Cr
Cc/Cr

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