CRL Master Key Systems & Key Control

Question 1

In a master key system, what is the function of a 'change key'?

Accepted Answer

It opens only one specific lock within the system

Answer

A change key (also called a servant key) is cut to operate only one specific lock within a master key system.

Question 2

What term describes a key that operates all locks within a specific group or section of a master key system?

Accepted Answer

Master key

Answer

A master key is designed to operate all locks within a specific group or section, sitting one level above change keys in the hierarchy.

Question 3

In a master key system hierarchy, what does a 'Grand Master Key' (GMK) operate?

Accepted Answer

Multiple groups or sections, each of which has its own master key

Answer

A Grand Master Key operates all locks across multiple sections or groups that each have their own master key, sitting above the master key level.

Question 4

What does 'MACS' stand for in master key system design?

Accepted Answer

Maximum Adjacent Cut Specification

Answer

MACS (Maximum Adjacent Cut Specification) is the maximum allowable difference between adjacent cuts on a key, ensuring reliable operation without binding.

Question 5

Which key occupies the apex of a complex master key system hierarchy and operates every lock in the entire system?

Accepted Answer

Top master key

Answer

The top master key is the highest-level key in a master key hierarchy, capable of operating every lock throughout the entire system.

CRL - Certified Registered Locksmith Practice Test

CRL - Certified Registered Locksmith Practice Test

CRL Master Key Systems & Key Control