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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
When a body floating in a liquid, is displaced slightly, it oscillates about

center of buoyancy
metacentre
e.g. of body
center of pressure

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Hydraulics & Fluid Mechanics
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

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

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

cohesion
surface tension
friction
viscosity

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

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

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Hydraulics & Fluid Mechanics
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

1:50
1 : 2.5
1 :25
1 : 5

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Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

head loss and discharge are same in two systems
friction factor and length are same in two systems
length of pipe and discharge are same in two systems
length and diameter are same in two systems

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