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Hydraulics & Fluid Mechanics

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

0°K
0°C
20°C
4°C

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Hydraulics & Fluid Mechanics
The discharge through a V- notch varies as

H3’2
H5/2
H1/2
H5’4 where H is head.

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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

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

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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

negative value
minimum
could be any value
maximum

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Hydraulics & Fluid Mechanics
The resultant of all normal pressures acts

vertically upwards
at center of pressure
at e.g. of body
at metacentre

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Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

an airfoil
a circular disc or plate held normal to flow
a cylinder
a sphere

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