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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Q. The head loss through the bed of solids of the filter can be determined by __________

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Q. Which of the following has the highest shape factor as stated by Carmen?

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Q. Which of the following is the expression of the Carmen equation where symbols have their usual meanings?

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Q. Which of the following represents the correct relation between dimensionless friction factor f and Reynolds number?

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Q. Which of the following is the expression of the Rose equation where symbols have their usual meanings?

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Q. When the Reynolds number is greater than 1.9 but less than 500, the coefficient of drag CD is?

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Q. The value of Reynolds number R is 1.5. The coefficient of drag is?

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Q. Rose equation is valid for beds in which voids are clear and unobstructed.

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Q. When does the particle become suspended in an expanded bed?

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Q. The superficial velocity in a stratified bed is equal to __________

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Q. Carmen-Kozney equation has been derived using which of the following equation?

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Q. In which of the following filter, water is passed under higher pressure?

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Q. What is the range of pressure in pressure filter?

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