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Fluid Mechanics

Fluid Mechanics
Curve III in the above diagram represents a/an

Dilatent fluid
Pseudo plastic fluid
None of these
Ideal plastic

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Fluid Mechanics
Specific speed of a centrifugal pump relates it with another pump having the

Same speed
Geometrical similarity
Same efficiency
Dynamic similarity

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Fluid Mechanics
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

HW/4(H + W)²
2HW/(H + W)²
HW/2(H + W)²
√(HW/π)

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Fluid Mechanics
Delivery of insufficient quantity of liquid by a pump may be caused by

All of these
Too high a lift
Air leak in the inlet
Low rpm

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Fluid Mechanics
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

12 m
10 m
11 m
20 m

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Fluid Mechanics
Transition from laminar flow to turbulent flow is aided by the

Pressure gradient and the compressibility of the flowing medium
Vibration
Surface roughness and curvature (i.e.sharp corners)
All of these

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