Q. The slow sand filter is designed for _____________

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Q. What is the frequency of cleaning of a slow sand filter?

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Q. What is the maximum filter head up to which slow sand filters are worked upon?

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Q. The depth of an enclosed tank of a rapid sand filter lies in the range of ______

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Q. The effective size of a rapid sand filter is ______

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Q. The finer the suspended impurities to be removed ___________

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Q. What is the value of the uniformity coefficient in a rapid sand filter?

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Q. What is the effective size of Anthracite when used as a filter material?

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Q. Consider the following statement regarding the depth of sand of the rapid gravity filter?

i. It should be checked against breakage of floc
ii. The sand depth should lie between 100-200cm
iii. The floc should be attached through the sand bed

Which of the above statement is/are correct?

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Q. Which of the following statement is wrong regarding Anthracite?

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Q. The minimum depth of sand of a rapid sand filter is given by __________

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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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