Q. The thickness of the base material of a rapid sand filter on which filter media are supported is __________

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Q. In which type of under drainage system of rapid sand filter, laterals are provided with strainers?

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Q. Which device is used to supply air for the agitation of sand grains during washing of filters?

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Q. The loss of head during cleaning operation of a rapid sand filter is __________

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Q. The thickness of the suspended matter on top of the sand bed is __________

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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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