Q. The direction of water in filter beds is reversed for ______

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Q. For a rapid sand filter, what is the ratio of length: breadth while designing it?

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Q. Calculate the area of the rapid sand filter for the following details.

Flow: 2000 m³/h.
Velocity: 5 m/h
Backwash time: 30 mins

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Q. Calculate the length of the rapid sand filter for the following details.

Flow: 1000 m³/h.
Velocity: 5 m/h
Backwash time: 30 mins

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Q. Calculate the breadth of the rapid sand filter for the following details.

Flow: 500 m³/h.
Velocity: 5 m/h
Backwash time: 20 mins

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Q. What is the turbidity achieved by using a rapid filtration system?

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Q. What is the limit of turbidity which a 2 stage filtration a handle?

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Q. What is the height of the anthracite maintained in a dual media filter?

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Q. What is the height maintained of a deep bed monomedia?

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Q. Disc filter is similar to a screen filter.

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Q. Filtration is based on colour of particles.

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Q. Which of the following parameter is used by disc filters?

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Q. Discs are colour coded to denote _______

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Q. What is the common unit used to measure filtration quality?

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Q. What is the value for the finest level of filtration?

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Q. What is the value for coarse filtration?

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Q. What is the smallest mesh size of the filter is used?

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Q. What is the maximum mesh size being used?

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Q. In which year was the disc filter developed?

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Q. Which of the following is an advantage of disc filter?

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