Discussion
The aspiration section of a cleaner removes
Answer: D
Correct answer: Material lighter in air than sound grain
Aspiration separates on terminal velocity - the air speed at which a particle just stays suspended. The air stream is set above the terminal velocity of chaff, dust, empty husks and shrivelled grain but below that of sound grain, so the light material is entrained and carried away while the grain falls through.
It removes precisely the fraction the screens cannot: material that matches the grain in size but not in weight. The entrained material is then recovered in a cyclone before the air is discharged.
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