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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

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

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Hydraulics and Fluid Mechanics in ME
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

Slow speed pump with radial flow at outlet
Medium speed pump with radial flow at outlet
High speed pump with radial flow at outlet
High speed pump with axial flow at outlet

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Hydraulics and Fluid Mechanics in ME
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

Difference
Arithmetic mean
Sum
Geometric mean

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Hydraulics and Fluid Mechanics in ME
The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

μ π³ N² R⁴ /3600 t
μ π³ N² R² /3600 t
μ π³ N² R² /1800 t
μ π³ N² R⁴ /1800 t

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Hydraulics and Fluid Mechanics in ME
The maximum efficiency of transmission through a pipe is

0.5
0.567
0.6667
0.7666

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Hydraulics and Fluid Mechanics in ME
Viscosity of water in comparison to mercury is

Same
Lower
Higher
Higher/lower depending on temperature

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