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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

b²/12 + x̅
(bd²/12) + x̅
(d²/12 x̅) + x̅
d²/12 + x̅

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Hydraulics and Fluid Mechanics in ME
If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

None of these
Geometric similarity
Kinematic similarity
Dynamic similarity

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H5/2
1.84(L - nH)H3
1.84(L - nH)H2
1.84(L - 0.1nH)H3/2

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Hydraulics and Fluid Mechanics in ME
Indicator diagram of a reciprocating pump is a graph between

Pressure in cylinder vs. swept volume
Pressure vs. speed
Flow vs. speed
Flow vs. swept volume

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

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Hydraulics and Fluid Mechanics in ME
The speed of a turbine runner is

Inversely proportional to H1/2
Directly proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2

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