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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The upper surface of a weir over which water flows is known is

sill
crest
weir top
nappe

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the pressure varies

Cube of fan speed
Directly as fan speed
Square of fan speed
Square root of fan speed

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Hydraulics and Fluid Mechanics in ME
The maximum efficiency of transmission through a pipe is

0.6667
0.7666
0.567
0.5

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Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Designing new impeller
Trimming the impeller size to the required size by machining
Not possible
Some other alterations in the impeller

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Hydraulics and Fluid Mechanics in ME
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

√(2gh)
2gH
H × √(2g)
2g × √H

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Hydraulics and Fluid Mechanics in ME
Centrifugal pump is started with its delivery valve

Kept 50% open
Irrespective of any position
Kept fully open
Kept fully closed

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