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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Q. __________ is an operation designed to force agitation in the fluid and induce coagulation.

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Q. The rate of change of velocity per unit distance normal to a section is called_______

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Q. What is the dimension formula of mean velocity gradient?

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Q. What is the desirable value of mean velocity gradient in a flocculator?

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Q. What is the normal value of the detention period adopted in a flocculator for design purpose?

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Q. The design value of the velocity of flow in a flocculator is _______

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Q. What is the detention period of a clarifier used in the treatment of water?

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Q. The pulsator clarifier is a type of __________

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Q. Which device solved the problem of unstable hydraulic conditions and operation of sludge removal equipment?

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Q. In which device, the primary mixing is followed by a secondary reaction zone resulting in formation of sludge blanket?

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Q. In which type of tube settler, tubes are slightly inclined in the direction of normal flow?

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Q. Which of the following statement is wrong regarding filtration?

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Q. In which action of filtration, particles coarser than the void size is arrested?

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