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Irrigation Engineering

Irrigation Engineering
The net speed under which the turbine reaches its peak efficiency is called

design speed
gross speed
operating speed
rated speed

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Irrigation Engineering
According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

V₀ = 0.84 mD0.54
V₀ = 0.55 mD0.54
V₀ = 0.84 mD0.64
V₀ = 0.55 mD0.64

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Irrigation Engineering
In case of a trapezoidal notch fall

Splay upstream from the notch section is 45°
Top length of the piers should not be less than their thickness
All listed here
Splay downstream from the notch section is 22½°

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Irrigation Engineering
For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)

1.25 hw
0.5 hw
1.50 hw
0.75 hw

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Irrigation Engineering
Which of the following is a flexible outlet ?

Gibb’s outlet
Kennedy’s gauge outlet
submerged pipe outlet
None of these

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Irrigation Engineering
Which of the following methods of applying water may be used on rolling land ?

boarder flooding
furrow flooding
check flooding
free flooding

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