Q. Dealkalization results in removal of all the ions from the water.

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Q. Organic contaminants are removed from the water by the process of ______

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Q. Which process of water treatment is done to avoid floating debris, branches, trees or other large particles suspended in water?

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Q. What is the size of the coarse screen used in pretreatment of water?

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Q. The coarse screen is inclined at _____ to facilitate the cleaning or raking.

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Q. The head loss through screen depends on _______________

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Q. The shape factor for circular rods in finding the head loss through the screen is _____

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Q. Micro strainers are used to remove color in water.

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Q. Identify the incorrect statement regarding aeration process.

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Q. The reduction of carbon dioxide by cascade aerators is in the range of __________

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Q. In which type of aerator, the flow of water is divided into fine streams and small droplets?

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Q. The elapsed time in gravity filter is 1sec. What is the height of fall in a single descent?

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Q. ______ are used in fine screen so that they do not get clogged up.

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Q. The Total hardness of soft water as CaCO₃ equivalent is __________

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Q. The total hardness of water is 100ppm as CaCO₃ equivalent. What is the type of water?

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Q. The permanent hardness in water is due to the presence of __________

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Q. The temporary hardness in water is due to the presence of __________

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Q. Which of the following causes the temporary hardness?

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Q. The permanent hardness is also known as __________

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Q. Which of the following is not used for removing the permanent hardness?

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