Q. When the loss of the head exceeds the static head, the head becomes _____

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Q. What is the permissible negative head loss of a rapid sand filter?

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Q. Which type of problem is caused in filter due to the accumulation of solids on the top surface of filter media?

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Q. ______ are formed in filters due to insufficient washing of sand grains.

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Q. The cracking of bed is more prominent __________

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Q. In which type of filtration problem, layers of gravel are displaced?

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Q. The tendency of jetting can be minimized by __________

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Q. _______ type of trouble in filter is caused by the released of dissolved air and gases from water.

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Q. How the problem of sand incrustation can be minimized?

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Q. In which of the following filters, the rate of filtration is highest?

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Q. The final loss of head in slow sand filter is ______ than rapid sand filter.

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Q. The turbidity of water applied to rapid sand filter is less than _______

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Q. The period of cleaning of a slow sand filter is ______ than rapid sand filter.

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Q. The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.

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Q. How is the grain size distribution of sand in rapid sand filter?

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Q. Consider the following statement.

i. The penetration of suspended matter is deep in the slow sand filter
ii. The penetration of suspended matter is superficial in the rapid sand filter
iii. Coagulation is not required in the slow sand filter

Which of the above statement is/are correct?

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Q. Consider the following statement.

i. The slow sand filter is not efficient in removing turbidity
ii. The slow sand filter has a high initial cost
iii. Skilled supervision is required in slow sand filter

Which of the above statement is/are correct?

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Q. The filter run in rapid sand filter should not be less than _____ hours.

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Q. Consider the following statement.

i. Slow sand filter is not flexible in variation in demand
ii. The rapid sand filter is flexible in fluctuations in demand
iii. The method of cleaning of a slow sand filter involves agitation and back-washing

Which of the above statement is/are correct?

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Q. Rapid sand filters are very efficient in removal of color.

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