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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Flow of water in a pipe about 3 meters in diameter can be measured by

rotameter
orifice plate
pitot tube
venturi

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

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

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Hydraulics & Fluid Mechanics
The line of action of the buoyant force acts through the centroid of the

displaced volume of the fluid
submerged body
volume of the floating body
volume of the fluid vertically above the body

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Hydraulics & Fluid Mechanics
Free surface of a liquid tends to contract to the smallest possible area due to force of

viscosity
surface tension
friction
cohesion

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

rotameter
Orifice plate
Venturimeter
pitot tube

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Hydraulics & Fluid Mechanics
For measuring flow by a venturimeter, if should be installed in

horizontal line
inclined line with upward flow
vertical line
in any direction and in any location.

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