Exercise: Irrigation

Questions for: Irrigation

For cereal crops the most commonly adopted method of irrigation, is
A:
free flowing method
B:
check method
C:
furrow method
D:
sprinkling method.
Answer: B
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If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor down stream of the crestwall, is given by the equation
A:
B:
C:
D:
Answer: C
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Process of meandering is due to
A:
sediment load of streams
B:
discharge and hydraulic properties of streams
C:
relative erodibility of the bed and banks
D:
all the above.
Answer: D
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According to Lacey, in regime conditions
A:
silt is kept in suspension by vertical components of eddies
B:
entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
C:
both (a) and (b)
D:
neither (a) nor (b).
Answer: C
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To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls
A:
of R.C.C. or steel plate 8 cm thick
B:
of height l/3rd to l/4th the depth of water in the main canal
C:
spaced at interval of times their heights
D:
extending about one metre beyond a line drawn at an inclination of 2 : 1 to the axis of main canal
Answer: E
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