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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is

80 r.p.m.
10 r.p.m.
20 r.p.m.
40 r.p.m.

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Hydraulics and Fluid Mechanics in ME
The unit speed of the turbine runner is

N/H
N/H3/2
N/H²
N/√H

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Hydraulics and Fluid Mechanics in ME
The viscosity of a gas

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

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Hydraulics and Fluid Mechanics in ME
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

1/16 to 1/8
1/8 to 1/4
1/3 to 1/2
1/4 to 1/3

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Hydraulics and Fluid Mechanics in ME
Which of the following velocity potentials satisfies continuity equation ?

x2 + y2
x2y
x2-y2
cosx

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Hydraulics and Fluid Mechanics in ME
A flow is called hyper-sonic, if the Mach number is

Unity
Between 1 and 6
Less than unity
None of these

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