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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

friction
surface tension
cohesion
viscosity

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Hydraulics & Fluid Mechanics
Drag force is a function of i) projected area of the body ii) mass density of the fluid iii) velocity of the body The correct answer is

(ii) and (iii)
(i), (ii) and (iii)
(i) and (ii)
(i) and (iii)

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Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

a cylinder
a circular disc or plate held normal to flow
an airfoil
a sphere

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

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

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Hydraulics & Fluid Mechanics
Flow at constant rate through a tapering pipe is i) steady flow ii) uniform flow iii) unsteady flow iv) non-uniform flow The correct answer is

(ii) and (iii)
(i) and (ii)
(ii) and (iv)
(i)and(iv)

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Hydraulics & Fluid Mechanics
For a floating body to be in stable equilibrium, its metacentre should be

above the center of gravity.
above the center of buoyancy
below the center of buoyancy
between e.g. and center of pressure

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