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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 cavitation in reaction turbines is avoided, to a great extent by

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

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

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

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel is

Tangential flow impulse turbine
Inward flow reaction turbine
Outward flow impulse turbine
Inward flow impulse turbine

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Hydraulics and Fluid Mechanics in ME
The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

0.4
0.5
0.8
0.6

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Hydraulics and Fluid Mechanics in ME
A point, in a compressible flow where the velocity of fluid is zero, is called

Vena contracta
None of the listed here
Critical point
Stagnation point

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