Discussion
Assertion (A): Adding plate area to a precipitator raises its pressure drop substantially.
Reason (R): Efficiency follows an exponential in plate area divided by gas flow.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The reason is a correct statement of the Deutsch-Anderson relation, but the assertion is false. A precipitator’s pressure drop is very low, a few hundred pascals, because the gas simply passes slowly between the plates with nothing obstructing it, and adding plate area changes that hardly at all. This is precisely why efficiency is improved by enlarging the unit rather than by forcing the gas harder, and why precipitators are so cheap to run.
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