Q. A flexible membrane impregnated with tar or bitumen is spread over the subgrade in _________________

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Q. Puddle clay is laid on the subgrade to form a fairly water-tight coating.

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Q. What is the safe limiting velocity for cement concrete lining?

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Q. The most economical type of lining is the one which shows ____________

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Q. Which of the following guideline is not recommended for the choice of lining when the bed width of the canal is up to 3 m?

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Q. Which of the following is not a cause for the hydrostatic pressure on the lining?

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Q. Drainage relief pockets are provided ___________

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Q. The permeability of lining is also governed by the depth of water in the canal and type of subgrade soil.

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Q. Pressure relief valves may help in ___________

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Q. Pipe drains run _______________

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Q. Which of the following statement is wrong about the requirement of good lining?

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Q. Which type of lining is adopted when the channels have become stable and no danger of scouring is expected?

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Q. Which of the following statement is incorrect about Expansive soils?

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Q. The larger the thickness of CNS introduced over the expansive soil, the more will be the resulting swelling in soil.

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Q. What is the recommended value of CNS thickness to be used for lining over expansive soil with swelling pressure of 200-300 KN/m²?

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Q. Safety ladders are generally provided on ___________

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Q. If the free swell index of soil is more than 100, the soil may be expansive.

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Q. Safety ladders are provided in large irrigation canals to ______________

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Q. CNS material shall be non-swelling with a minimum of ___________

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Q. Which of the following is incorrect about the identification of CNS material?

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