Q. If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

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Q. In Chezy's formula V = C √rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is

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Q. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

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Q. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

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Q. Setting out the alignments of sewers may start from

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Q. If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

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Q. In normal conditions, the period for sludge digestion, is

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Q. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

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Q. For a continuous flow type of sedimentation tanks

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Q. The temperature affects the

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Q. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is

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Q. The quantity of liquid waste which flows in sewers during the period of rainfall, is known

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Q. The most efficient cross-section of sewers in a combined sewerage system is

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Q. Pick up the incorrect size of stone ware sewers

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Q. The grit and silt of the grit chambers, may not be used for

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Q. In a sludge tank, the gas mainly produced, is

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Q. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

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Q. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be

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Q. The most efficient cross section of sewers in a separate sewerage system is

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Q. If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

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