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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

equal
slightly less
slightly more
nearly half

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

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

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Hydraulics and Fluid Mechanics in ME
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

None of these
More than
Less than
Equal to

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Hydraulics and Fluid Mechanics in ME
Piezometer is used to measure

Very low pressures
Atmospheric pressure
Difference of pressure between two points
Pressure in pipe, channels etc

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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

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

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Hydraulics and Fluid Mechanics in ME
The increase of temperature results in

increase in viscosity of liquid
increase in viscosity of gas
decrease in viscosity of gas
decrease in viscosity of liquid

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