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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

0.5 m3/s
0.25 m3/s
1.5 m3/s
2.5 m3/s

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Hydraulics and Fluid Mechanics in ME
In an immersed body, center of pressure is

above the center of gravity
could be above or below e.g. depending on density of body and liquid
at the center of gravity
below be center of gravity

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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
Air vessels in reciprocating pump are used to

Save pump from cavitations
Reduce acceleration to minimum
Increase pump efficiency
Smoothen flow

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Hydraulics and Fluid Mechanics in ME
Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

Directly proportional to N
Inversely proportional to N
Directly proportional to N²
Inversely proportional to N²

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Hydraulics and Fluid Mechanics in ME
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

0.488
0.884
0.848
0.392

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