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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

maximum at the pipe wall
independent of shear stress
None of these
zero at the pipe wall

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Hydraulics & Fluid Mechanics
Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are

(i) and (iv)
(i) and (iii)
(ii) and (iv)
(ii) and (iii)

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Hydraulics & Fluid Mechanics
Pressure of the order of 10''' torr can be measured by

Bourdon tube
Pirani Gauge
Micro-manometer
ionisastion gauge

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Hydraulics & Fluid Mechanics
For a floating body to be in equilibrium

meta center should be above e.g.
center of buoyancy and e.g. must lie on same vertical plane
a righting couple should be formed
All of these

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Hydraulics & Fluid Mechanics
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

minimum
maximum
negative value
could be any value

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

the height of barometer will be less
it is the best liquid
its vapour pressure is so low that it may be neglected
both (B) and (C)

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