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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 discharge of wheel is

0.25 m3/s
2.5 m3/s
0.5 m3/s
1.5 m3/s

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Hydraulics and Fluid Mechanics in ME
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Hm Q) / ηo
(w Q ηo) / Hm
(w Q) / (Hm × ηo)
(w Hm) / (Q × ηo)

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Hydraulics and Fluid Mechanics in ME
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is

4
43924
2
1

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Hydraulics and Fluid Mechanics in ME
The absolute pressure is equal to

Gauge pressure - vacuum pressure
Gauge pressure + atmospheric pressure
Atmospheric pressure - gauge pressure
Gauge pressure - atmospheric pressure

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

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

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Hydraulics and Fluid Mechanics in ME
According to Bernoulli's equation

Z - p/w + v²/2g = constant
Z - p/w - v²/2g = constant
Z + p/w + v²/2g = constant
Z + p/w - v²/2g = constant

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