Civil Engineering - Irrigation

Exercise :: Irrigation - Section 2

21. 

Useful soil moisture for plant growth, is

A. capillary water
B. gravity water
C. hygroscopic water
D. chemical water
E. all the above.

Answer: Option A

Explanation:

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22. 

A hydraulic structure is designed to withstand

A. seepage forces
B. hydraulic jump
C. hydraulic pressure
D. all the above.

Answer: Option D

Explanation:

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23. 

In gravity canals, F.S.L. is

A. always at the ground level
B. always below the ground level
C. generally 4 to 5 metres above the ground level
D. only a few cm above the ground level.

Answer: Option D

Explanation:

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24. 

If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

A. x = r1 d1
B. x = r2 d2
C. x = d1 / r1
D. x = d2 / r2

Answer: Option B

Explanation:

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25. 

The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

A. syphon
B. super passage
C. aqueduct
D. super-aqueduct
E. syphon aqueduct.

Answer: Option E

Explanation:

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