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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

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

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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

could be any value
negative value
maximum
minimum

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Hydraulics & Fluid Mechanics
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

1/2 R
2/3 R
3/4 R
1/3 R

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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

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

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Hydraulics & Fluid Mechanics
An open vessel of water is accelerated up an inclined plane. The free water surface will

make an angle in opposite direction to inclination of inclined plane
be horizontal
make an angle in direction of inclination of inclined plane
any one of above is possible

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Hydraulics & Fluid Mechanics
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is

9.81 m/sec²
10.2/m sec
10m/sec²
9.75 m/sec²

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