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

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

Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
Directly proportional to H1/2

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Hydraulics and Fluid Mechanics in ME
The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is

[wa (V - v²)]/g
[wa (V - v)]/g
[wa (V - v)²]/2g
[wa (V - v)]/2g

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

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Hydraulics and Fluid Mechanics in ME
The power developed by a turbine is (where H = Head of water under which the turbine is working)

Directly proportional to H3/2
Inversely proportional to H1/2
Directly proportional to H1/2
Inversely proportional to H3/2

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Hydraulics and Fluid Mechanics in ME
A submerged body is said to be in a stable equilibrium, if its centre of gravity __________ the centre of buoyancy.

None of these
Lies below
Lies above
Coincides with

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