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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

cohesion
surface tension
viscosity
friction

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

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

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Hydraulics & Fluid Mechanics
Uniform flow occurs when

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

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Hydraulics & Fluid Mechanics
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

50 M/SEC
33 M/SEC
40 M/SEC
22.5 M/SEC

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Hydraulics & Fluid Mechanics
A fluid is said to be ideal, if it is

inviscous and compressible
incompressible
inviscous and incompressible
inviscous

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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

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

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