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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

675
300
337.5
600

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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 adhesion
force of diffusion
force of friction
force of cohesion

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Hydraulics & Fluid Mechanics
Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are

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

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Hydraulics & Fluid Mechanics
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

maximum
minimum
could be any value
negative value

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Hydraulics & Fluid Mechanics
The density of water is 1000 kg/m3 at

20°C
0°C
0°K
4°C

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Hydraulics & Fluid Mechanics
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

6.4 m above the hydraulic gradient
5.0 above the hydraulic gradient
10.0 m above the hydraulic gradient
2.4 m above the hydraulic gradient

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