Q.Assertion (A) : Majority of threads intended for use in machine sewing are constructed with (S) twist. Reason (R) : Thread with (Z) twist becomes untwisted by the action of machines and then fray and breaks. Codes :
Correct answer: Both (A) and (R) are incorrect.
Explanation
The thread use in machine sewing are (Z) twisted thread. Z twist is anticlockwise twist of yarn, which do not untwist easily. Thread with (S) twist become untwisted by the action of machines and can easily fray and break.
The thread use in machine sewing are (Z) twisted thread. Z twist is anticlockwise twist of yarn, which do not untwist easily. Thread with (S) twist become untwisted by the action of machines and can easily fray and break.