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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 + sin φ)/2
(1 - cos φ)/2
(1 + cos φ)/2
(1 - sin φ)/2

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Hydraulics and Fluid Mechanics in ME
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

Increases
None of these
Remain same
Decreases

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Hydraulics and Fluid Mechanics in ME
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

Submerged weir
Narrow-crested weir
Broad-crested weir
Ogee weir

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Hydraulics and Fluid Mechanics in ME
Unit of surface tension is

Energy/unit area
Velocity/unit area
Both of the above
It has no units

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Hydraulics and Fluid Mechanics in ME
The coefficient of discharge for an external mouthpiece is

0.855
0.5
0.707
0.375

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Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Eight times
Sixteen times
Four times
Double

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