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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)

2 H/3
H/2
H/3
2 H/5

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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

minimum
maximum
negative value
could be any value

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Hydraulics & Fluid Mechanics
The peoperty by virtue of which a liquid opposes relative motion between its different layers is called

viscosity
surface tension
osmosis
co-efficient of viscosity

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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

600
300
675
337.5

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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
Uniform flow occurs when

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

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