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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H3/2
1.84(L - 0.1nH)H5/2
1.84(L - nH)H3
1.84(L - nH)H2

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is

Inversely proportional to H3/2
Directly proportional to H3/2
Inversely proportional to H5/2
Directly proportional to H5/2

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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.
40 r.p.m.
20 r.p.m.

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Hydraulics and Fluid Mechanics in ME
A streamline is defined as the line

along which the pressure drop is uniform
of equal yelocity in a flow
parallel to outer surface of pipe
parallel to central axis flow

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Hydraulics and Fluid Mechanics in ME
For centrifugal pump impeller, the maximum value of the vane exit angle is

15° to 20°
20° to 25°
25° to 30°
10° to 15°

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Cavitation will be formed
No flow will take place
Efficiency will be low
Excessive power will be consumed

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