Question

Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: As compared to parallel wound yarn packages, ring bobbins exhibit lower tendency of slough off during unwinding.
[r]: The main winding layers in the ring bobbins are separated by cross-winding layers.

• A. Both [a] and [r] are true and [r] is the correct reason for [a]
• B. Both [a] and [r] are true and [r] is not the correct reason for [a]
• C. Both [a] and [r] are false
• D. [a] is true but [r] is false

Hint:

Cross-winding in ring bobbins provides mechanical stability by preventing sloughing off during unwinding, as the yarn layers are interwoven.

Answer 1

The Correct Option is A

In this problem, we are tasked with determining whether the assertion and reason are correct, and if so, whether the reason correctly explains the assertion. Let's break this down. Step 1: Understand the concept of yarn winding.
In textile manufacturing, yarn winding is the process of winding the yarn onto a bobbin or spool. The two most common types of winding are parallel winding and cross winding. In parallel winding, the yarn is wound side by side, leading to a uniform and often more easily unwound yarn package. In contrast, cross-wound bobbins, such as those used in ring spinning, involve layers of yarn wound at an angle, which creates a more compact and stable yarn package. This structure is designed to improve yarn stability during unwinding. Step 2: Analyze the assertion.
The assertion [a] claims that ring bobbins have a lower tendency to slough off during unwinding compared to parallel-wound yarn packages. This statement is true. Ring bobbins are cross-wound, meaning the yarn layers are interlaced in a crisscross pattern. This structure prevents the yarn from loosening or slipping off easily when the yarn is unwound, as each layer is supported by the adjacent layers. In contrast, parallel-wound yarns are more prone to sloughing off because they lack this interlocking structure and can easily slip or loosen as they unwind. Step 3: Analyze the reason.
The reason [r] states that the main winding layers in the ring bobbins are separated by cross-winding layers. This is also true. In ring bobbins, the yarn is wound in a helical or crosswise pattern, which provides mechanical stability to the structure. The cross-winding layers help separate the main winding layers, which prevents them from becoming tightly packed or loosely wound, thereby reducing slough-off during unwinding. This cross-winding feature is one of the key reasons that ring bobbins are more stable than parallel-wound packages. Step 4: Conclusion.
Both the assertion [a] and the reason [r] are true, and [r] correctly explains why [a] is true. The reason explains the structural feature (cross-winding) that directly leads to the lower slough-off tendency of ring bobbins. Therefore, the correct answer is (A).