Q. When the impurities are separated by the gravitation of settling particles, the operation is called ______

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Q. In which type of sedimentation, the flocculent suspension of high concentration takes place?

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Q. In which type of sedimentation, the flocculent suspension of the intermediate concentration takes place?

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Q. How many types of sedimentation tanks are there on the basis of the method of operation?

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Q. _______ is formed when alum is added to sewage.

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Q. In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?

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Q. In the expression vS = 1.8 (g*d (G-1))½, the diameter of spherical particle is ____________

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

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

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

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

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

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

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

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

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