Q. Pick up the correct statement from the following :

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Q. Pick up the correct statement from the following :

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Q. In sewers the velocity of flow should not be

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Q. If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

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Q. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

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Q. The design period of sewage treatment works in normally

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Q. The porosity of sediments in sewer pipes, is usually taken as

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Q. The sewer which received discharge from two or more main sewers, is known as

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Q. A well oxidized sewage contains nitrogen mainly as

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Q. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

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Q. Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R) : It helps to accommodate the scum in the septic tank.

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Q. Pick up the incorrect statement from the following :

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Q. Pick up the correct statement from the following :

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Q. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

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Q. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

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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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