Discussion
Statement I: A fabric filter's collection is done chiefly by the fabric itself.
Statement II: The dust cake that accumulates on the fabric is a far finer filter than the weave.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Statement I is incorrect but Statement II is correct
Statement II is correct and it is why statement I is wrong. The fabric’s weave has openings far larger than the particles it must catch; what does the collecting is the dust cake built up on its surface, whose interstices are of particle scale. The fabric is the support on which that cake forms. This is why efficiency is lowest immediately after cleaning and why a filter is never cleaned back to bare fabric.
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