Locksmith Licensing Examination
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
Question 1
What is the primary purpose of a master key system in a commercial facility?
A. To reduce the total number of keys issued to employees
B. To allow a single key to open all locks in the facility regardless of hierarchy
C. To provide graduated access where one key opens multiple designated locks
while individual keys open only specific locks
D. To eliminate the need for rekeying when employees leave
Answer: C. To provide graduated access where one key opens multiple
designated locks while individual keys open only specific locks
Rationale: A master key system is designed with a hierarchy of access. A master
key opens all locks in the system, while sub-master keys open groups of locks, and
change keys open only individual locks. This allows for controlled, graduated
access throughout a facility, which is essential for security management in
commercial settings. Options A and D are oversimplified and incorrect; B describes
a grand master system, not the primary purpose.
Question 2
Which type of pin tumbler lock component is responsible for transferring
rotational motion from the key to the plug?
A. Driver pins
B. Key pins
,C. The cam
D. The shear line
Answer: C. The cam
Rationale: In a pin tumbler lock, the cam is the component attached to the rear of
the plug that transfers rotational motion to the locking bolt or latch mechanism.
Driver pins and key pins are responsible for blocking rotation at the shear line until
correctly aligned. The shear line is the gap between the plug and the housing, not
a component that transfers motion.
Question 3
When rekeying a standard 5-pin residential lock, which tool is essential for
removing the plug from the cylinder housing?
A. Plug follower
B. Key extractor
C. Tension wrench
D. Shim pick
Answer: A. Plug follower
Rationale: A plug follower is a cylindrical tool used to push the plug out of the
cylinder housing while keeping the driver pins and springs contained within the
housing. This prevents the driver pins from falling into the plug chamber during
rekeying. Key extractors remove broken keys, tension wrenches apply torque for
picking, and shim picks are used for bypass, not for plug removal in standard
rekeying.
Question 4
What does the "bitting" of a key refer to?
A. The metal composition of the key blank
B. The depths and spacing of the cuts along the key blade
C. The shoulder stop position on the key bow
D. The number of wards in the keyway
,Answer: B. The depths and spacing of the cuts along the key blade
Rationale: Bitting is the specific sequence of cut depths and their positions along
the key blade, which corresponds to the pin heights in the lock. This code
determines which key will operate a given lock. Metal composition, shoulder stop
position, and wards relate to key blank selection, not the cutting pattern.
Question 5
In a wafer tumbler lock, what happens when the correct key is inserted?
A. The wafers are pushed upward into the housing
B. The wafers are rotated 90 degrees to align with the sidebar
C. The wafers are aligned at the shear line between the plug and housing
D. The wafers are pulled downward into the plug by spring tension
Answer: C. The wafers are aligned at the shear line between the plug and
housing
Rationale: In a wafer tumbler lock, each wafer has a spring that pushes it into the
plug or housing. When the correct key is inserted, the bitting pushes each wafer to
a specific height where all wafers are flush with the shear line—the boundary
between the plug and housing—allowing the plug to rotate. Unlike pin tumblers,
wafers do not rely on upward or downward movement exclusively, but alignment
at the shear line is universal.
Question 6
Which of the following best describes the function of a deadbolt lock?
A. It uses spring tension to automatically retract the bolt upon turning the knob
B. It requires manual operation and has a bolt that extends deeper into the door
frame for enhanced security
C. It is designed exclusively for glass doors and storefronts
D. It operates with a push-button combination on the interior side
Answer: B. It requires manual operation and has a bolt that extends deeper into
the door frame for enhanced security
, Rationale: A deadbolt is a locking mechanism that must be manually operated (by
key or thumb turn) and features a bolt that extends a minimum of 1 inch into the
door frame, making it resistant to forced entry. Unlike spring-latch locks, deadbolts
are not spring-loaded. They are used on various door types, not exclusively glass,
and do not inherently have push-button combinations.
Question 7
What is the correct procedure for impressioning a key for a pin tumbler lock?
A. Filing the key blank until it operates the lock without any visible marks
B. Inserting a blank key, wiggling it, and filing the marked high spots until all pins
are set at the shear line
C. Cutting the key to the manufacturer's original bitting code using a code machine
D. Using a key duplicator to copy an existing key that fits the lock
Answer: B. Inserting a blank key, wiggling it, and filing the marked high spots
until all pins are set at the shear line
Rationale: Impressioning is a non-destructive method of key origination. A blank
key is inserted into the lock, turned under tension, and wiggled. The pins leave tiny
marks on the blank at the points where they contact. The locksmith files those
marks and repeats the process until all pins are set to the correct depths, allowing
the key to turn the plug. Options A, C, and D describe other methods that are not
impressioning.
Question 8
Which type of lock is most commonly used in prison cells and high-security
detention facilities due to its resistance to tampering?
A. Mortise lock
B. Rim cylinder lock
C. Electro-mechanical strike lock
D. Sliding bolt lock with key override
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
Question 1
What is the primary purpose of a master key system in a commercial facility?
A. To reduce the total number of keys issued to employees
B. To allow a single key to open all locks in the facility regardless of hierarchy
C. To provide graduated access where one key opens multiple designated locks
while individual keys open only specific locks
D. To eliminate the need for rekeying when employees leave
Answer: C. To provide graduated access where one key opens multiple
designated locks while individual keys open only specific locks
Rationale: A master key system is designed with a hierarchy of access. A master
key opens all locks in the system, while sub-master keys open groups of locks, and
change keys open only individual locks. This allows for controlled, graduated
access throughout a facility, which is essential for security management in
commercial settings. Options A and D are oversimplified and incorrect; B describes
a grand master system, not the primary purpose.
Question 2
Which type of pin tumbler lock component is responsible for transferring
rotational motion from the key to the plug?
A. Driver pins
B. Key pins
,C. The cam
D. The shear line
Answer: C. The cam
Rationale: In a pin tumbler lock, the cam is the component attached to the rear of
the plug that transfers rotational motion to the locking bolt or latch mechanism.
Driver pins and key pins are responsible for blocking rotation at the shear line until
correctly aligned. The shear line is the gap between the plug and the housing, not
a component that transfers motion.
Question 3
When rekeying a standard 5-pin residential lock, which tool is essential for
removing the plug from the cylinder housing?
A. Plug follower
B. Key extractor
C. Tension wrench
D. Shim pick
Answer: A. Plug follower
Rationale: A plug follower is a cylindrical tool used to push the plug out of the
cylinder housing while keeping the driver pins and springs contained within the
housing. This prevents the driver pins from falling into the plug chamber during
rekeying. Key extractors remove broken keys, tension wrenches apply torque for
picking, and shim picks are used for bypass, not for plug removal in standard
rekeying.
Question 4
What does the "bitting" of a key refer to?
A. The metal composition of the key blank
B. The depths and spacing of the cuts along the key blade
C. The shoulder stop position on the key bow
D. The number of wards in the keyway
,Answer: B. The depths and spacing of the cuts along the key blade
Rationale: Bitting is the specific sequence of cut depths and their positions along
the key blade, which corresponds to the pin heights in the lock. This code
determines which key will operate a given lock. Metal composition, shoulder stop
position, and wards relate to key blank selection, not the cutting pattern.
Question 5
In a wafer tumbler lock, what happens when the correct key is inserted?
A. The wafers are pushed upward into the housing
B. The wafers are rotated 90 degrees to align with the sidebar
C. The wafers are aligned at the shear line between the plug and housing
D. The wafers are pulled downward into the plug by spring tension
Answer: C. The wafers are aligned at the shear line between the plug and
housing
Rationale: In a wafer tumbler lock, each wafer has a spring that pushes it into the
plug or housing. When the correct key is inserted, the bitting pushes each wafer to
a specific height where all wafers are flush with the shear line—the boundary
between the plug and housing—allowing the plug to rotate. Unlike pin tumblers,
wafers do not rely on upward or downward movement exclusively, but alignment
at the shear line is universal.
Question 6
Which of the following best describes the function of a deadbolt lock?
A. It uses spring tension to automatically retract the bolt upon turning the knob
B. It requires manual operation and has a bolt that extends deeper into the door
frame for enhanced security
C. It is designed exclusively for glass doors and storefronts
D. It operates with a push-button combination on the interior side
Answer: B. It requires manual operation and has a bolt that extends deeper into
the door frame for enhanced security
, Rationale: A deadbolt is a locking mechanism that must be manually operated (by
key or thumb turn) and features a bolt that extends a minimum of 1 inch into the
door frame, making it resistant to forced entry. Unlike spring-latch locks, deadbolts
are not spring-loaded. They are used on various door types, not exclusively glass,
and do not inherently have push-button combinations.
Question 7
What is the correct procedure for impressioning a key for a pin tumbler lock?
A. Filing the key blank until it operates the lock without any visible marks
B. Inserting a blank key, wiggling it, and filing the marked high spots until all pins
are set at the shear line
C. Cutting the key to the manufacturer's original bitting code using a code machine
D. Using a key duplicator to copy an existing key that fits the lock
Answer: B. Inserting a blank key, wiggling it, and filing the marked high spots
until all pins are set at the shear line
Rationale: Impressioning is a non-destructive method of key origination. A blank
key is inserted into the lock, turned under tension, and wiggled. The pins leave tiny
marks on the blank at the points where they contact. The locksmith files those
marks and repeats the process until all pins are set to the correct depths, allowing
the key to turn the plug. Options A, C, and D describe other methods that are not
impressioning.
Question 8
Which type of lock is most commonly used in prison cells and high-security
detention facilities due to its resistance to tampering?
A. Mortise lock
B. Rim cylinder lock
C. Electro-mechanical strike lock
D. Sliding bolt lock with key override
