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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Q. Consider the following statements regarding sand as filter material.

i. It should be free from clay or silt
ii. Organic matter should be present in the sand
iii. It should be nonuniform

Which of the above statement is/are correct?

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Q. The uniformity characteristics of sand expressed in terms of __________

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Q. ____ represents the size of sand particle such that 10% of particles are finer than this size.

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Q. What is Cᵤ in the expression Cᵤ= D₆₀/D₁₀ where D₆₀ and D₁₀ are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?

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Q. The effective size of sand of the slow sand filter is __________

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