CML Keying Systems & Key Control 4

Question 1

What does 'keyed alike' (KA) mean when specified on a lock order?

Accepted Answer

All locks in the order are operated by the same key

Answer

Keyed alike means all locks specified operate with the same key cut combination, commonly used when a customer wants one key to open multiple locks.

Question 2

In a master key system, 'selective master keying' means:

Accepted Answer

A key is masterkeyed to open specific locks chosen from across different groups

Answer

Selective master keying creates a key that opens a custom combination of locks regardless of their group assignment, used for special access needs.

Question 3

What is the correct procedure when a key is reported lost in a high-security master key system?

Accepted Answer

Rekey only the locks the lost key could access and update the key control log

Answer

Best practice is to rekey all locks accessible by the lost key to eliminate the security risk, then update the key control log to reflect the change.

Question 4

What is a 'construction master key' (CMK) and what happens to it after construction?

Accepted Answer

A key used to open all locks during construction that is voided when occupants move in by turning a key or activating a mechanism

Answer

A construction master key allows access during building construction and is voided when the permanent occupant uses their key, which triggers a pin change that disables the CMK.

Question 5

Which standard governs the grading of key control and high-security cylinders in the United States?

Accepted Answer

UL 437

Answer

UL 437 is the Underwriters Laboratories standard that defines requirements for high-security key locks and cylinders, including resistance to picking, drilling, and key control.

(CML) Certified Master Locksmith Practice Test

(CML) Certified Master Locksmith Practice Test

CML Keying Systems & Key Control 4