Discussion
A gravity table deck oscillates at \( 400 \) cycles per minute with a stroke of \( 12 \) mm. The mean deck speed during a stroke is
Answer: A
Correct answer: 0.16 m/s
Each complete cycle covers the stroke twice, out and back:
\[ v = \frac{400 \times 2 \times 0.012}{60} = \frac{9.6}{60} = 0.16\ \mathrm{m/s} \]
The distractor \( 0.08 \) counts only one stroke per cycle. The oscillation does two things at once on a gravity table: it fluidises the bed in combination with the upward air, and it conveys the settled heavy fraction uphill along the deck to its outlet.
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