Discussion
Assertion (A): Increasing fan speed improves sample cleanliness without penalty.
Reason (R): A stronger blast removes more of the light fraction from the sieves.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The assertion is false. Raising fan speed carries a definite penalty: a stronger blast takes grain out with the chaff, so blown loss rises.
The reason is true - the blast does remove more of the light fraction, which is why the sample looks cleaner. The two effects are inseparable, and setting the shoe means choosing a point on that trade rather than escaping it. Judging by the appearance of the sample alone will always push the fan too high.
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