Discussion
Assertion (A): Cylinder speed is quoted as a peripheral speed rather than in revolutions per minute.
Reason (R): It is the speed at the cylinder surface that the crop actually experiences.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the convention. It is the surface speed that determines the energy of the blow the crop receives, and that depends on the diameter as well as the revolutions.
A 0.6 m cylinder at 700 rev/min and a 0.4 m cylinder at 1050 rev/min both give 22 m/s and thresh alike. Quoting revolutions alone would make settings meaningless between machines, which is why manuals give peripheral speed and leave the operator to convert.
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