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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

2V/(vr + v)
2V/(vr - v)
V/(vr + v)
V/(vr - v)

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R3/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R1/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

2000 kg
1000 kg
500 kg
1500 kg

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Hydraulics and Fluid Mechanics in ME
Water is _________ liquid.

An incompressible
None of these
A compressible
Both A and B

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Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

Speed at which the valve is closed
Elastic properties of the liquid flowing through the pipe
All of these
Elastic properties of the pipe material

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Hydraulics and Fluid Mechanics in ME
Geometric similarity is said to exist between the model and the prototype, if both of them

Are equal in size and shape
Have identical forces
Are identical in shape, but differ only in size
Have identical velocities

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