Q. Clogging of sewers, is caused due to

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Q. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

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Q. The coagulant widely used for sewage treatment, is

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Q. House connections to the laterals is generally made by

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Q. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

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Q. Dilution method of disposing off sewage, is not preferred to

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Q. For house drainage minimum gradient is

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Q. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

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Q. The ratio of minimum hourly flow to the average flow of sewage is

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Q. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

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Q. The sewage is pumped up

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Q. Removal of oil and grease from sewage, is known

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Q. The gas which may cause explosion in sewers, is

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Q. In sewers the effect of scouring is more on

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Q. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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Q. Pick up the correct statement from the following :

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Q. The non-clog pump which permits solid matter to pass out with the liquid sewage, is

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Q. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

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Q. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

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Q. Flocculated particles do not change their

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