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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

rotameter
pitot tube
Venturimeter
Orifice plate

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Hydraulics & Fluid Mechanics
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is

1/4
1/2
2/3
1/3

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Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of adhesion
force of friction
force of cohesion
force of diffusion

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Hydraulics & Fluid Mechanics
The surface tension of mercury at normal temperature compared to that of water is

more
less
same
more or less depending on size of glass tube

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Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

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

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Hydraulics & Fluid Mechanics
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

more than the weight of the body
the weight of the body
less than the weight of the body
weight of the fluid displaced by the body

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