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Irrigation Engineering

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

design head
operating head
gross head
rated head

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Irrigation Engineering
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

D = (8.6 Δ/B)
D = Δ (8.64 D/B)
B = Δ (8.64 B/D)
Δ = (8.6 B/D)

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Irrigation Engineering
In Montague type fall

A circular glacis is provided
No glacis is provided
A straight glacis is provided
A parabolic glacis is provided

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Irrigation Engineering
Vertical drop fall is satisfactory for a height upto

5.0 m
3.5 m
0.5 m
1.5 m

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Irrigation Engineering
For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is

Zero
0.25
0.5
1

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Irrigation Engineering
Meandering of a river generally occurs, in

Boulder stage
Trough stage
Rocky stage
Delta stage

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