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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2000 is called

Super-sonic velocity
Sub-sonic velocity
Higher critical velocity
Lower critical velocity

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Hydraulics and Fluid Mechanics in ME
One cubic metre of water weighs

100 liters
500 liters
1000 liters
250 liters

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Hydraulics and Fluid Mechanics in ME
The static head of a centrifugal pump is equal to the _________ of suction head and delivery head.

Product
Difference
Sum
None of these

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Hydraulics and Fluid Mechanics in ME
In one dimensional flow, the flow

Takes place in curve
Is steady and uniform
Takes place in one direction
Takes place in straight line

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

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Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.75 to 0.85
0.85 to 0.90
0.50 to 0.65
0.65 to 0.75

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