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Fluid Mechanics

Fluid Mechanics
If the head over the triangular notch is doubled, the discharge will increase by __________ times.

4
2
5.657
2.828

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Fluid Mechanics
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is

< 1
> 1
1

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Fluid Mechanics
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

Σ
L/σ
D
1/d

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Fluid Mechanics
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

Gear
Positive displacement
Sump
Piston

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Fluid Mechanics
Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

All of these
Back flow of fluid in the event of stoppage of pump
Discharge pressure
Flow of liquid during operation of the pump

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Fluid Mechanics
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

All of these
Head of the liquid pumped
BHP required by the pump
NPSH required

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