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Hydraulics and Fluid Mechanics in ME

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

0.95 times
0.81 times
0.67 times
0.34 times

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - nH)H2
1.84(L - 0.1nH)H5/2
1.84(L - 0.1nH)H3/2
1.84(L - nH)H3

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Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

All of these
It has minimum wetted perimeter
It gives maximum discharge for a given cross-sectional area and bed slope
It involves lesser excavation for the designed amount of discharge

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is successfully used for lifting water to the boilers?

Centrifugal pump
Airlift pump
Reciprocating pump
Jet pump

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Hydraulics and Fluid Mechanics in ME
Euler's number is the ratio of __________ force to pressure force.

Viscous
Gravity
None of these
Inertia

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

0.5 v₁²/2g
v₁²/2g
v₂²/2g
0.375 v₂²/2g

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