Q. The lakes are classified into how many types on the basis of productivity?

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Q. The depth of Euphotic zone is measured by ____________

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Q. How many types of aerators are commonly used in the treatment of wastewater?

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Q. Organic contaminants are removed from the wastewater by ____________

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Q. By which process, odor producing substances are oxidized?

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Q. Which of the following process is used to remove the colloidal particles from the effluent?

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Q. In which form of solute stabilization, hydrogen sulfide in the effluent is oxidized into sulfate?

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Q. In which unit operation, gases are released or absorbed in the effluent?

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Q. Which form of solute stabilization occurs when effluent passes through limestone?

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Q. Solids are removed from the wastewater by which of the following unit operation?

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Q. Dealkalization results in removal of all the ions from the wastewater.

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Q. The minimum spacing between the bars on fine screen is ____________

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Q. The spacing between the bars in racks is ____________

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Q. Screens are inclined to the direction of flow to ____________

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Q. The maximum spacing between the bars in medium screen is ____________

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Q. __________ is used to cut the sewage into smaller parts.

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Q. What is the maximum capacity of medium screen in collecting solids?

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Q. The head loss through the screen is given by HL = k* (Vₜ² – Vₐ²), where Vₜ and Vₐ are velocities through and above the screen respectively. What is the value of constant k?

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Q. The unit of dynamic viscosity is ____________

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Q. Which of the following has minimum detention period?

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