Discussion
Statement I: A specific gravity separator works without any air flow.
Statement II: The deck oscillates to walk the separated fractions to their outlets.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. A specific gravity separator depends absolutely on air flow: air is blown upward through the perforated deck to fluidise the bed, so that dense particles sink to the deck surface and light ones float above.
Statement II is correct and describes the other half of the mechanism. The deck oscillates to walk the settled heavy fraction uphill to its outlet while the fluidised light fraction flows downhill to another. Both actions are needed - air alone would stratify the bed without conveying it anywhere.
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