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Hydraulics and Fluid Mechanics in ME

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

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

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Hydraulics and Fluid Mechanics in ME
The buoyancy depends upon the

Compressibility of the liquid
Weight of the liquid displaced
Pressure with which the liquid is displaced
Viscosity of the liquid

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Hydraulics and Fluid Mechanics in ME
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters)

wQHs
wQ (Hs - Hd)
wQHd
wQ (Hs + Hd)

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Hydraulics and Fluid Mechanics in ME
Practical fluids

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

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Hydraulics and Fluid Mechanics in ME
The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as

Volumetric efficiency
Manometric efficiency
Mechanical efficiency
Overall efficiency

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Hydraulics and Fluid Mechanics in ME
Which of the following statement is correct as regard to water wheels?

They give constant efficiency, even if the discharge is not constant
All of these
They have slow speeds
They are suitable even for low water heads

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