Q. How the performance of the rapid sand filter can be improved?

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Q. The size of Anthracite used in dual media filter is __________

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Q. In mixed media filter, the filtration is done from ______

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Q. What is the ratio in which coal, sand and garnet are present in the mixed media filter?

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Q. Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter?

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Q. Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter?

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Q. Which of the following is the best filter in terms of rate of filtration?

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Q. In which type of filter, water flows in upward direction?

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Q. The up flow filter is used in domestic water supply.

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Q. In which type of filter, the filtration is done in two opposite directions at the same time?

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Q. Which material is provided for the down-flow bed in dual media bi-flow filter?

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Q. The rate of filtration of a Micro-Strainer is __________ litres / hour.

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Q. Which material is provided for the up flow bed in dual media bi-flow filter?

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Q. Which device is used for screening stored water which do not contain microscopic sized particles?

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Q. What is the diameter of drum of a Micro-Strainer?

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Q. What is the thickness of a layer of a diatomite filter?

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Q. The diatomite is applied on the septum at the rate of ______

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Q. Consider the following statements regarding diatomite filters.

i. They are not used for water having high turbidity.
ii. They are not suitable for municipal water supplies.
iii. They are not used for temporary and shifting camps.

Which of the above statement is/are false?

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Q. How many types of settling are there in the sedimentation tank?

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Q. The settling velocity of spherical particle is given by ____________

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