Locksmith Advanced Topics 2 — Questions and Answers
Question 1: What is the primary function of a 'master wafer' in a master key system?
- It permanently locks the cylinder
- It allows multiple keys to operate the same lock (Correct answer)
- It disables the spring mechanism
- It prevents key duplication
Correct answer: It allows multiple keys to operate the same lock
Master wafers create an additional shear line that allows both the change key and the master key to align the tumblers at the correct height.
Question 2: Which type of high-security lock cylinder uses rotating disc tumblers instead of traditional pin stacks?
- Tubular lock
- Disc detainer lock (Correct answer)
- Wafer lock
- Lever tumbler lock
Correct answer: Disc detainer lock
Disc detainer locks use rotating discs that must all align to a specific angle for the lock to open, offering high resistance to picking.
Question 3: When rekeying a Schlage B-series deadbolt, what tool is used to depress the retaining clip and remove the plug?
- Pick gun
- Follow tool (plug follower) (Correct answer)
- Key gauge
- Plug spinner
Correct answer: Follow tool (plug follower)
A plug follower is inserted behind the plug as it is pushed out to keep the driver pins and springs contained in the shell.
Question 4: In a Grand Master Key (GMK) system, which level of key has the broadest access?
- Change key
- Master key (MK)
- Grand Master Key (GMK) (Correct answer)
- Sub-master key
Correct answer: Grand Master Key (GMK)
The Grand Master Key sits at the top of the hierarchy and operates all locks within the entire system.
Question 5: What is 'key bitting specification' (KBS) used for in locksmithing?
- Measuring the width of key blanks
- Defining the depth and spacing of cuts on a key (Correct answer)
- Testing the tensile strength of a key
- Identifying the manufacturer of a key
Correct answer: Defining the depth and spacing of cuts on a key
The KBS defines the cut depths and spacing increments allowable for a particular keyway, ensuring keys are cut within manufacturer tolerances.
Question 6: A locksmith is asked to install a lock rated ANSI/BHMA Grade 1. What does this rating primarily indicate?
- The lock is decorative only
- The lock meets the highest commercial durability and security standards (Correct answer)
- The lock is designed for residential use only
- The lock is certified for fire doors exclusively
Correct answer: The lock meets the highest commercial durability and security standards
ANSI/BHMA Grade 1 is the highest rating, indicating the lock has passed stringent cycle tests and withstood forced-entry attempts suitable for heavy commercial use.
Question 7: What does the term 'TOK' (Turn of the Key) refer to in automotive locksmithing?
- A method of decoding a lock by feel during turning (Correct answer)
- A keyway profile unique to Chrysler vehicles
- The number of ignition positions in a column
- A transponder programming mode
Correct answer: A method of decoding a lock by feel during turning
TOK is a technique where the locksmith applies slight rotational pressure while reading the resistance at each pin stack to decode the key cuts.
Locksmith Advanced Topics 2
What is the primary function of a 'master wafer' in a master key system?