Question 33 (Textile Engineering & Fibre Science)
Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: Open-loop autolevelling system needs a signal storage device with time delay function.
[r]: The signal must be stored until the material reaches the adjusting point.
|(A)||Both [a] and [r] are true and [r] is the correct reason for [a]|
|(B)||Both [a] and [r] are true but [r] is not the correct reason for [a]|
|(C)||Both [a] and [r] are false|
|(D)||[a] is true but [r] is false|
Frequently Asked Questions | FAQs
What is open loop autolevelling system?
An open-loop autolevelling system is a type of control system used in textile machinery, specifically in the production of yarns. The autolevelling system is used to maintain a consistent level of tension on the yarn or sliver as it is being spun or wound onto a package.
In an open-loop autolevelling system, the tension on the yarn is controlled by adjusting the speed of the feed rollers, which feed the yarn into the spinning or winding process. The adjustment is based on a pre-set reference value, such as the desired level of tension, and is not influenced by feedback from sensors or other sources.
The open-loop autolevelling system is relatively simple and inexpensive to implement, but it may not be as accurate or responsive as a closed-loop system, which uses feedback from sensors to adjust the tension in real-time. As a result, open-loop autolevelling systems are typically used in applications where the level of tension can tolerate some variation, such as in the production of coarser yarns.
Overall, the use of autolevelling systems in textile machinery helps to ensure consistent quality and reduce waste by minimizing the occurrence of defects and breaks in the yarn during production.