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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Practical fluids

possess surface tension
are viscous
are compressible
possess all the above properties

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Hydraulics and Fluid Mechanics in ME
Stoke is the unit of

Dynamic viscosity in M. K. S. units
Kinematic viscosity in M. K. S. units
Dynamic viscosity in S. I. units
Kinematic viscosity in C. G. S. units

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

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

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Hydraulics and Fluid Mechanics in ME
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

(bd²/12) + x̅
(d²/12 x̅) + x̅
b²/12 + x̅
d²/12 + x̅

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Hydraulics and Fluid Mechanics in ME
In series-pipe problems

the head loss is same through each pipe
a trial solution is not necessary
the discharge through each pipe is added to obtain total discharge
the discharge is same through each pipe

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Hydraulics and Fluid Mechanics in ME
The increase of temperature results in

decrease in viscosity of gas
decrease in viscosity of liquid
increase in viscosity of gas
increase in viscosity of liquid

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