North Carolina Locksmith Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

The concept described as the range of marks on a combination lock dial within which the last item of the combination must not be set is known as the Forbidden Zone. This term is used to ensure that if the last number of the combination is set within this specific area, it can lead to an inability to open the lock, as the mechanism may not recognize it properly due to the positioning within that zone.

Understanding the Forbidden Zone is crucial for locksmiths and those working with combination locks, as it helps in setting the combination accurately and prevents potential errors that could result in lockouts. Mastering this concept can help technicians effectively troubleshoot and maintain combination locks in various applications.

In contrast, the other terms do not accurately describe this specific range. The Index refers to the mark or position indicating the current setting of the lock but does not define a restricted area. Hand Change pertains to the manual adjustment of the lock's mechanism and does not describe any spatial limits, while Drop In generally refers to a type of lock or method of insertion rather than a restriction on dial settings.