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Hydraulics & Fluid Mechanics

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 :25
1:50
1 : 5
1 : 2.5

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

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

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Hydraulics & Fluid Mechanics
Uniform flow occurs when

size and shape of the cross section in a particular length remain constant
the flow is steady
the flow is streamline
size and cross section change uniformly along length

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Hydraulics & Fluid Mechanics
Separation of flow occurs when

the cross-section of a channel is reduced
the boundary layer comes to rest
the pressure intensity reaches a minimum
All of these

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Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

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

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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 friction
force of cohesion
force of adhesion
force of diffusion

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