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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A flow is called super-sonic if the

Velocity of flow is very high
Mach number is between 1 and 6
None of these
Discharge is difficult to measure

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Hydraulics and Fluid Mechanics in ME
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be

5 meters of water column
3 meters of water column
2 meters of water column
6 meters of water Column

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Hydraulics and Fluid Mechanics in ME
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

0.95 times
0.34 times
0.67 times
0.81 times

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × depth
1/2 × breadth
1/2 × sloping side
1/4 × (depth + breadth)

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Hydraulics and Fluid Mechanics in ME
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)

0.223 R
0.423 R
0.707 R
0.577 R

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Hydraulics and Fluid Mechanics in ME
Which of the following has highest coefficient of discharge ?

CipoUetti weir
Borda’s mouthpiece running full
sharp edged orifice
venturimeter

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