Given below are two statements one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The configuration and orientation of fibres in a yarn decides the uniformity of twisted yarn.
Reason (R): The proper drafting in different stages of spinning changes the configuration and orientation of fibres.
In the light of the above statements, choose the most appropriate answer from the options given below:
Show Hint
- Both (A) and (R) are correct and (R) is the correct explanation of (A)
- Both (A) and (R) are correct but (R) is not the correct explanation of (A)
- (A) is correct but (R) is not correct
- (A) is not correct but (R) is correct
The Correct Option is B
Solution and Explanation
Step 1: Analyzing Assertion (A).
If fibers are hook-shaped, tangled, or poorly oriented, the resulting yarn will have "thick" and "thin" places. Therefore, the configuration and orientation are indeed critical to the final uniformity of the yarn. Thus, (A) is correct.
Step 2: Analyzing Reason (R).
Drafting is the process of thinning out a fiber strand. In every stage (draw frame, speed frame, ring frame), drafting rollers pull the fibers, which helps straighten them and align them more parallel to the yarn axis. Thus, (R) is correct.
Step 3: Evaluating the Relationship.
While both statements are true, (R) describes *how* configuration is changed, while (A) describes *the effect* of that configuration on uniformity. However, uniformity is primarily decided by the evenness of fiber distribution (mass variation) during drafting, rather than just the configuration/orientation itself. Therefore, (R) is a true statement but not the direct mechanical explanation for (A).
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