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Hydraulics & Fluid Mechanics

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

viscosity
friction
surface tension
cohesion

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

centriod of the displaced volume of fluid
center of the volume of floating body
center of gravity of any submerged body
centroid of the volume of fluid vertically above the body

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Hydraulics & Fluid Mechanics
The region between the separation streamline and the boundary surface of the solid body is known as

wake
lift
boundary layer
drag

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

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

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Hydraulics & Fluid Mechanics
The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is

TURBULENT FLOW
NOT PREDICTABLE FROM THE GIVEN DATA
LAMINAR FLOW
TRANSITION FLOW

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Hydraulics & Fluid Mechanics
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

2 m/sec
25 m/sec
50 m/sec
10 m/sec

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