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

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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. _______ is formed when alum is added to sewage.

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

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

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

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Q. What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10⁻³ cm. Given G=2.65, viscosity v=8 * 10⁻³ cm²/Sec?

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Q. Which of the following cannot be the velocity of flow in the horizontal flow sedimentation tank?

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