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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Flow occurring in a pipeline when a valve is being opened is

unsteady
vortex
laminar
steady

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Hydraulics and Fluid Mechanics in ME
The Bernoulli's equation is based on the assumption that

All of these
No force except gravity acts on the fluid
There is no loss of energy of the liquid flowing
The velocity of flow is uniform across any cross-section of the pipe

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R5/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)
14π R1/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
An average value of coefficient of velocity is

0.84
0.97
0.76
0.62

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Hydraulics and Fluid Mechanics in ME
For a body floating in a liquid the normal pressure exerted by the liquid acts at

e.g. of the body
all points on the surface of the body
metacentre
bottom surface of the body

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for the fans having constant wheel diameters, the power demand varies

Square root of fan speed
Square of fan speed
Cube of fan speed
Directly as fan speed

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