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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Q. In which action of filtration, colloidal particles are removed?

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Q. Which is the first zone of purification in a sand bed?

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Q. Schmutzdecke acts as an extremely fine meshed straining mat.

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Q. In which action of filtration, removal of particulate matter takes place?

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Q. In which type of filter, rate of filtration is low?

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Q. What is the color of the surface coating formed during the filtration process?

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Q. In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely.

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Q. The filtration rate of a slow sand filter is _____ litres of water per square metre.

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Q. Identify the correct statement from the following options.

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Q. Which of the following is not commonly used as a filter material in the treatment of water?

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Q. Which of the following is correct regarding the cheapest filter material used in water treatment?

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