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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Reaction turbines are used for

Low head
Low head and high discharge
High head and low discharge
High head

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1 / (V1 - V2)
V1² / (V1² - V2²)
(V­1 - V2) / V1
(V­1² - V2²) / V1²

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × depth
1/4 × (depth + breadth)
1/2 × sloping side
1/2 × breadth

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Hydraulics and Fluid Mechanics in ME
The center of gravity of the volume of the liquid displaced by an immersed body is called

metacentre
center of pressure
center of buoyancy
center of gravity

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Hydraulics and Fluid Mechanics in ME
If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

H = Hg × hf
H = Hg/hf
H = Hg + hf
H = Hg - hf

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Hydraulics and Fluid Mechanics in ME
The power developed by a turbine is (where H = Head of water under which the turbine is working)

Inversely proportional to H3/2
Inversely proportional to H1/2
Directly proportional to H1/2
Directly proportional to H3/2

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