Hydraulics and Fluid Mechanics in ME
The viscosity of a gas

is independent of temperature
decreases with increase in temperature
is independent of pressure for very high pressure intensities
increases with increase in temperature

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Hydraulics and Fluid Mechanics in ME
The overall efficiency of a reaction turbine is the ratio of

Actual work available at the turbine to the energy imparted to the wheel
Power produced by the turbine to the energy actually supplied by the turbine
None of these
Work-done on the wheel to the energy (or head of water) actually supplied to the turbine

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