Discussion
Statement I: A purifier separates particles that a sieve alone cannot.
Statement II: Bran flakes and endosperm particles of the same size differ in density and terminal velocity.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. A purifier passes the stock over an oscillating sieve while air is drawn upward through it, so particles are sorted by terminal velocity as well as by aperture.
That matters because a flake of bran and a granule of endosperm may pass the same sieve while differing greatly in density: the light flake is lifted by the air current and carried off, while the dense endosperm particle falls through. Sieving alone could not separate them, which is why purifiers sit between the break and reduction systems.
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