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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water

51 cm
52.2 cm
52 cm
50 cm

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Hydraulics and Fluid Mechanics in ME
The flow ratio in case of Francis turbine varies from

1 to 1.5
0.4 to 0.5
0.15 to 0.3
0.6 to 0.9

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Hydraulics and Fluid Mechanics in ME
Gauge pressure at a point is equal to the absolute pressure ___ the atmospheric pressure.

Divide
Multiply
Plus
Minus

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Hydraulics and Fluid Mechanics in ME
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

4 x (225)3/2 minutes
4 minutes
4 x V225 minutes
4 (225)1/3 minutes

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

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

equal
slightly more
slightly less
nearly half

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