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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 hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

(p/W) × (a/A)
(W/p) × (A/a)
(W/p) × (a/A)
(p/W) × (A/a)

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Hydraulics and Fluid Mechanics in ME
The unit of kinematic viscosity in S. I. units is

N-s/m2
m2/s
N-m
N-m/s

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Hydraulics and Fluid Mechanics in ME
The runaway speed of a hydraulic turbine is the speed

At which the turbine will run freely without load
Corresponding to maximum overload permissible
At full load
At which there will be no damage to the runner

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Hydraulics and Fluid Mechanics in ME
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is

2
1
43924

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Hydraulics and Fluid Mechanics in ME
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Equal to
More than
Less than
None of these

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