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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

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

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Hydraulics and Fluid Mechanics in ME
Braking jet in an impulse turbine is used

To change the direction of runner
None of these
To bring the runner to rest in a short time
To break the jet of water

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Hydraulics and Fluid Mechanics in ME
In a static fluid

Fluid pressure is zero
Resistance to shear stress is small
Only normal stresses can exist
Linear deformation is small

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

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

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Hydraulics and Fluid Mechanics in ME
Liquids transmit pressure equally in all the directions. This is according to

Archimedes principle
Boyle's law
Pascal's law
Newton's formula

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Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

All of these
It gives maximum discharge for a given cross-sectional area and bed slope
It involves lesser excavation for the designed amount of discharge
It has minimum wetted perimeter

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