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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

nearly half
slightly more
equal
slightly less

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Hydraulics and Fluid Mechanics in ME
The impeller of a centrifugal pump may have

Vortex casing
Any one of these
Volute casing with guide blades
Volute casing

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R5/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)
14π R1/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
The length of a liquid stream while flowing over a weir __________ at the ends of the sill.

None of these
Does not change
Contracts
Expands

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Hydraulics and Fluid Mechanics in ME
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.64
0.78
0.46
0.87

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Hydraulics and Fluid Mechanics in ME
Differential monometer is used to measure

difference of pressure between two points
atmospheric pressure
pressure in pipes, channels etc
very low pressure

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