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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.65 to 0.75
0.85 to 0.90
0.50 to 0.65
0.75 to 0.85

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

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

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Hydraulics and Fluid Mechanics in ME
The pressure at the summit of a syphon is

equal to atmospheric
less than atmospheric
more than atmospheric
None of these

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Hydraulics and Fluid Mechanics in ME
The Reynold's number of a ship is __________ to its velocity and length.

None of these
Inversely proportional
Square root of velocity
Directly proportional

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Hydraulics and Fluid Mechanics in ME
Practical fluids

are compressible
possess surface tension
are viscous
possess all the above properties

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Hydraulics and Fluid Mechanics in ME
The specific gravity of an oil whose specific weight is 7.85 kN/m3, is

1.6
1.2
0.8
1

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