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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

Less than
Equal to
More than
None of these

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

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(2/3) Cd × b × √(2g) × H3/2
(2/3) Cd × b × √(2g) × H
(2/3) Cd × b × √(2g) × H2
(2/3) Cd × b × √(2gH)

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Hydraulics and Fluid Mechanics in ME
Which of the following is an example of laminar flow?

Flow past tiny bodies
Flow of oil in measuring instruments
All of these
Underground flow

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Hydraulics and Fluid Mechanics in ME
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

0.392
0.848
0.492
0.688

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Hydraulics and Fluid Mechanics in ME
The pressure at a point 4 m below the free surface of water is

49.24 kPa
19.24 kPa
29.24 kPa
39.24 kPa

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