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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Rain drops are spherical because of

viscosity
atmospheric pressure
air resistance
surface tension forces

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is successfully used for lifting water to the boilers?

Airlift pump
Reciprocating pump
Centrifugal pump
Jet pump

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Hydraulics and Fluid Mechanics in ME
Bulk modulus of a fluid is the ratio of

Critical velocity to the viscosity of fluid
Increase in volume to the viscosity of fluid
Increase in pressure to the volumetric strain
Shear stress to shear strain

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Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.75 to 0.85
0.65 to 0.75
0.85 to 0.90
0.50 to 0.65

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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

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
A metal with specific gravity of o floating in a fluid of same specific gravity a will

float over fluid
partly immersed
be fully immersed with top surface at fluid surface
sink to bottom

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