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The coarse screen is inclined at _____ to facilitate the cleaning or raking.

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The coarse screen is inclined at _____ to facilitate the cleaning or raking.

(a) 300

(b) 350

(c) 450

(d) 900

This question was posed to me in a job interview.

The above asked question is from Types of Screens and Aerators topic in division Unit Operations, Screening and Aeration of Environmental Engineering

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Right answer is (c) 450

For explanation: The coarse screen is inclined at 450-600 so that they can be easily cleaned with a rake. Moreover, it reduces the flow velocity which also helps in cleaning the screen.

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