New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

To protect a filter lens properly, should a clear glass lens be placed in front and behind it?

1. True

2. False

3. Only in front

4. Only behind

The correct answer is: True

The reasoning behind protecting a filter lens by placing a clear glass lens in front and behind it is primarily based on ensuring that the filter lens is shielded from potential damage while also maintaining its functional integrity. A clear glass lens can act as a barrier against physical impacts, dust, and scratches that could otherwise compromise the filter's effectiveness. By having a clear lens in front, the filter is protected from any objects that might come into contact with it during use or transit. The additional clear lens behind serves a similar purpose by preventing any wear or damage from the rear side, which may also encounter environmental factors or other equipment. This setup is particularly useful in applications where the filter may be subject to abrasive conditions or where repeated handling is expected. This approach to protection ensures that the filter lens can operate effectively for a longer period, reducing the need for replacements and maintaining optimal performance.