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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The property of a fluid which enables it to resist tensile stress is known as

cohesion
surface tension
adhesion
compressibility

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

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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

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

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Hydraulics and Fluid Mechanics in ME
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

Q = π.b.Vf
Q = π.D.bf.V
Q = D.b.Vf
Q = π.D.Vf

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Hydraulics and Fluid Mechanics in ME
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be

3.5 metres of water column
2 metres of water column
4 m of water column
3 metres of water column

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Hydraulics and Fluid Mechanics in ME
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to

0.0001
0.1
0.001
0.01

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