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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

slightly more
nearly half
equal
slightly less

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Hydraulics and Fluid Mechanics in ME
Any change in load is adjusted by adjusting following parameter on turbine

Flow
Absolute velocity
Blade velocity
Net head

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Hydraulics and Fluid Mechanics in ME
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

(q²/g)1/3
(q⁴/g)1/5
(q/g)1/2
(q³/g)1/4

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

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

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Hydraulics and Fluid Mechanics in ME
The viscosity of water at 20°C is

One centipoise
One poise
One centistoke
One stoke

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Hydraulics and Fluid Mechanics in ME
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

All of these
viscosity
frictional force
surface friction

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