North Carolina Locksmith Practice Exam

The term that refers to a key operating two or more groups of locks with different master keys is the Grand Master Key. This key is designed to provide access to multiple master-keyed systems, allowing the holder to operate distinct groups of locks while each group maintains its unique master key.

In a typical master key system, each group of locks is controlled by a specific master key, ensuring that the keys for each group are separate for security and management reasons. The Grand Master Key then adds a higher level of control by allowing access to all those groups, facilitating ease of access for managers or authorized personnel without compromising the individual security of each subgroup.

Other options do not fulfill this specific function. A Change Key operates a single lock within a master key system, the Great Grand Master Key extends this concept further but is generally used in larger systems with multiple layers, and a Block Master is not a standard locksmithing term for this context. Thus, the Grand Master Key is the precise answer for the question posed.