North Carolina Locksmith Practice Exam

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Which term defines a deadbolt that requires a key from both sides to operate?

Keyless Entry Deadbolt
Single Cylinder Deadlock
Double Cylinder Deadlock
Automated Deadbolt

The correct answer is: Double Cylinder Deadlock

The term that defines a deadbolt requiring a key from both sides to operate is the double cylinder deadlock. This type of deadbolt provides an enhanced level of security because it cannot be accessed without a key on either side, making it harder for intruders to unlock the door through a window or any space adjacent to the lock that might allow them to manipulate it. In situations where security is paramount, such as in homes or businesses that have glass near the doors, the double cylinder deadlock is particularly advantageous. However, it is essential to note that this type of lock can introduce some safety concerns, especially in emergencies, since it requires a key to exit. The other options represent different types of locking mechanisms. A keyless entry deadbolt does not require a key at all, instead utilizing codes or key fobs, while a single cylinder deadlock only requires a key on one side and typically has a thumb turn on the other side, making it easier to operate in emergencies. An automated deadbolt integrates electronic features, potentially enabling remote access or smart home compatibility but does not operate using a key from both sides.