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

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

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

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Hydraulics and Fluid Mechanics in ME
Ratio of inertia force to elastic force is known as

Weber’s number
Mach number
Froude number
Reynold’s number

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Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure above the nappe is negative
The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric
The pressure below the nappe is negative

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Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2000 is called

Sub-sonic velocity
Lower critical velocity
Super-sonic velocity
Higher critical velocity

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Hydraulics and Fluid Mechanics in ME
Working principle of dead weight pressure gauge tester is based on

Pascal’s law
Avogadro’s hypothesis
Newton’s law of viscosity
Dalton’s law of partial pressure

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