Discussion
Assertion (A): A rasp-bar cylinder reduces the load on the cleaning shoe.
Reason (R): It breaks less straw into short pieces than a spike-tooth cylinder does.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the second explains the first. A rasp-bar works by rubbing the mat against the concave, whereas a spike-tooth strikes it; impact shatters straw and rubbing does not.
Short straw fragments pass through the concave with the grain and arrive at the cleaning shoe, where they must be sieved and blown out. Less broken straw therefore means a lighter load on the shoe and a cleaner sample for the same fan setting - a benefit realised two stations downstream of the cause.
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