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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
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
22.5 M/SEC
40 M/SEC

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Hydraulics & Fluid Mechanics
Surface energy per unit area of a surface is numerically equal to

force of cohesion
atmospheric pressure
force of adhesion
surface tension

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Hydraulics & Fluid Mechanics
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

increase/decrease depending on depth of immersion
increase
remain same
decrease

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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

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

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Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

pitot tube
Venturimeter
rotameter
Orifice plate

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