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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem

All of these
Orifice plate
Venturimeter
pitot tube

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

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Hydraulics and Fluid Mechanics in ME
A balloon lifting in air follows the following principle

principle of buoyancy
Archimedes principle
All of these
law of gravitation

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Hydraulics and Fluid Mechanics in ME
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

(2/3) × Cd (L - nH) × √(2g) × H²
(2/3) × Cd (L - nH) × √(2g) × H5/2
(2/3) × Cd (L - nH) × √(2gh)
(2/3) × Cd (L - 0.1nH) × √(2g) × H3/2

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Hydraulics and Fluid Mechanics in ME
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

0.8
0.75
1
1.2

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Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2800, is called

Super-sonic velocity
Higher critical velocity
Lower critical velocity
Sub-sonic velocity

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