Discussion
Arrange the stages of a typical grain cleaning line in order:
1. Aspiration to remove light chaff and dust
2. Scalping to remove oversize trash
3. Grading on sizing screens
4. Destoning to remove dense foreign matter
Select the correct sequence.
Answer: C
Correct answer: 2, 1, 3, 4
The order works from coarsest contaminant to finest. Scalping comes first (2), removing oversize trash that would blind everything downstream. Aspiration follows (1), lifting away light chaff and dust before they interfere with the screens.
Grading on sizing screens (3) then sorts the cleaned grain, and destoning (4) removes the dense foreign matter that has passed every previous stage - stones being of grain size and heavier than grain, so neither the screens nor the air can catch them.
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