Q. D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is

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Q. For detecting the nitrites in the sewage, the matching colour may be developed by adding

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Q. The suitable cross-section of sewers to carry combined flow, is

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Q. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

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Q. In 1000 kg of sewage, the total solids approximate

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Q. Pathogens (or pathogentic bacterias) in water may cause

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Q. Sewer manholes are generally provided at

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Q. The sewers

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Q. Before discharging the foul sewage into rivers, it is generally treated by

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Q. The settlement of a particle in sedimentation tank, is affected by

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Q. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

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Q. Oxidation process results in the formation of

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Q. Dry weather flow is :

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Q. As compared to fresh river water, sea water contains oxygen

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Q. Sewer pipes need be checked for

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Q. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

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Q. The ratio of design discharge to the surface area of a sedimentation tank is called

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Q. In the activated sludge process

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Q. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

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Q. In detritus tanks,

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