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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of gases __________ with rise in temperature.

Remain unaffected
None of these
Increases
Decreases

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Hydraulics and Fluid Mechanics in ME
The cavitation in reaction turbines is avoided, to a great extent by

All of these
Installing the turbine below the tail race level
Providing highly polished blades to the runner
Using stainless steel runner of the turbine

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Hydraulics and Fluid Mechanics in ME
Geometric similarity is said to exist between the model and the prototype, if both of them

Have identical velocities
Are equal in size and shape
Have identical forces
Are identical in shape, but differ only in size

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Hydraulics and Fluid Mechanics in ME
Euler’s dimensionless number relates the following

pressure force and inertial force
inertial force and gravity
viscous force and inertial force
viscous force and buoyancy force

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Hydraulics and Fluid Mechanics in ME
The angle of contact in case of a liquid depends upon

both of die above
any one of the above
the material which exists above the free surface of the liquid
the nature of the liquid and the solid

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Hydraulics and Fluid Mechanics in ME
Low specific speed of turbine implies it is

Any one of the above
Impulse turbine
Propeller turbine
Francis turbine

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