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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The number of buckets on the periphery of a Pelton wheel is given by

(D/2d) + 20
(D/2d) + 15
(D/2d) + 5
(D/2d) + 10

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Hydraulics and Fluid Mechanics in ME
Cavitation is caused by

low pressure
weak material
high pressure
high velocity

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

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Hydraulics and Fluid Mechanics in ME
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

Equal to
None of these
Less than
More than

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Hydraulics and Fluid Mechanics in ME
Viscosity of water in comparison to mercury is

Higher/lower depending on temperature
Same
Lower
Higher

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Hydraulics and Fluid Mechanics in ME
Delivery head of a centrifugal pump is

Inversely proportional to N²
Directly proportional to N²
Directly proportional to N
Inversely proportional to N

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