Q. _______ is used below sinks to prevent entry of foul gases.

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Q. How deep is the water seal in the water closet?

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Q. What is the preferred class of iron pipes?

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Q. Cast iron pipes should confirm to IS 1729.

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Q. What is the maximum specification for water cement ratio?

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Q. The mixing time of concrete prior to placement should not exceed 20 minutes.

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Q. What is the standard brick size?

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Q. What is the expected depth tolerance in bricks?

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Q. What is the preferred size of water closet pan?

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Q. What is the capacity of the preferred low level flushing cistern?

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Q. What is the diameter of flush pipe?

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Q. What is the size of preferred taps for wash basins?

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Q. What is the depth of concrete required for half-round channels for surface drains?

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Q. What is the ratio of cement to be used to plaster the drain at the bottom of the camber?

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Q. What is the depth of brick masonry required in inspection chambers?

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Q. What is the number of coats of paint required for manhole covers?

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Q. What is the quantity of powder required in 1000 litres of water for sterilization?

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Q. How many types of pumps are present?

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Q. Submersible pumps require high maintenance.

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Q. What is the minimum diameter of pipes used for drainage of waste water?

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