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Hydraulics and Fluid Mechanics in ME

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

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

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Hydraulics and Fluid Mechanics in ME
Euler’s dimensionless number relates the following

viscous force and inertial force
inertial force and gravity
pressure force and inertial force
viscous force and buoyancy force

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Hydraulics and Fluid Mechanics in ME
If the depth of water in an open channel is greater than the critical depth, the flow is called

Turbulent flow
Critical flow
Torrential flow
Tranquil flow

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Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

tanθ = 2 a/g
tanθ = a/2g
tanθ = a/g
tanθ = a2/2g

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Hydraulics and Fluid Mechanics in ME
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

w × Q × H
w × Q × hf
w × Q (H + hf)
w × Q (H - hf)

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Hydraulics and Fluid Mechanics in ME
The hydraulic grade line is

always sloping downward in the direction of flow
never above the energy grade line
All of these
always above the centre line of pipe

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