Q. Range of Displacement efficiency in the plain sedimentation tank is ___________

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Q. The quantity of water flowing per hour per unit horizontal area is called ________

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Q. Settling tank efficiency is reduced by _______

i. Eddy current
ii. Surface current
iii. Density current

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Q. 1cm per second settling velocity corresponds to a surface loading of ______ litre per day per m².

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Q. What will be the surface area of the basin for a flow of 2*10⁶ litre per day having a surface loading rate 10,000 litre/day/m²?

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Q. The detention period of the vertical flow clarifier is _______

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Q. The design value of surface loading for horizontal flow circular sedimentation is _______

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Q. Detention time for a circular tank is given by _______

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Q. The sedimentation basin should be made as deep as possible.

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Q. What is formed when coagulant is added to water?

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Q. The chemical composition of Alum is _____________

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Q. The chemical compound which is insoluble in water, formed when alum is added to water is _____________

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Q. Which gas is released when alum is added to water?

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Q. What indicates the permanent hardness when alum is added to water?

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Q. Alum is effective when pH of water is between ____

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Q. Why Alum is preferred over other coagulants?

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Q. The chemical composition of Chlorinated Copperas is __________

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Q. Ferric chloride is effective over a pH range of __________

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Q. Why Magnesium carbonate is not commonly preferred as coagulant?

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Q. Which of the following statement is wrong regarding Iron salt?

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