Discussion
Assertion (A): Precipitators are built with several fields in series.
Reason (R): Efficiency follows an exponential in plate area, so each field removes a similar fraction of what reaches it.
Select the correct answer from the options below.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason accounts for the arrangement. Because efficiency follows an exponential in plate area, each field removes a similar proportion of what reaches it - so if the first takes 90 per cent, the second takes 90 per cent of the remaining tenth, and so on. Three or four fields in series therefore reach 99.5 per cent and above, and the fields are separately energised so that one can be taken out for maintenance.
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