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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Q. Which of the following statement is wrong regarding hard water?

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Q. The permanent hardness can be removed by adding lime and soda.

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Q. The time required for the mixing of lime and soda in lime soda process is _____________

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Q. The temperature at which the softening of water takes place by lime soda process is ____________

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Q. Which chemical is used for removing the permanent hardness of Calcium chloride?

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Q. Softening chemicals, lime and soda do not depend on ____________

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Q. The detention period of a lime soda treatment plant is ____________

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Q. The minimum reaction time allowed in the recarbonation basin is ____________

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Q. What is the pH at which recarbonation should be done?

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Q. Which filter is normally used in the lime soda treatment plant?

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