Contractor Exam Questions And

CA D16 Hardware, Locks & Safes Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which type of lock uses a spring-loaded bolt to secure a door?
• Deadbolt
• Latch bolt
• Mortise lock
• Padlock

Rationale: Latch bolts use a spring mechanism that allows the bolt to

retract when the handle is turned, automatically securing the door when released.

• What is the primary purpose of a master key system?
• To prevent lock picking
• To allow multiple locks to be opened by one key
• To provide electronic access control
• To increase lock durability

Rationale: Master key systems are designed so that one key can open

multiple locks while each lock also has its unique key.

• Which type of safe is best for fire protection?
• Combination safe
• Fire-rated safe
• Wall safe
• Floor safe

Rationale: Fire-rated safes are constructed with materials that

withstand high temperatures to protect contents during a fire. 1 / 3

• What is the main difference between a mortise lock and a cylindrical

lock?

• Mortise locks are for cabinets
• Cylindrical locks are stronger
• Mortise locks require a pocket cut into the door
• Cylindrical locks require specialized keys

Rationale: Mortise locks are installed into a pocket (mortise) within

the door, while cylindrical locks are installed through a simple hole in the door.

• Which hardware component is used to prevent a door from slamming?
• Deadbolt
• Strike plate
• Door closer
• Latch

Rationale: Door closers control the closing speed of a door,

preventing it from slamming and causing damage.

• What is the recommended way to lubricate a lock?
• Using oil
• Using water
• Using graphite powder
• Using grease

Rationale: Graphite powder lubricates locks without attracting dust,

unlike oil or grease which can gum up the mechanism.

• Which type of lock is commonly used in high-security applications?
• Padlock
• Mortise lock
• Electronic lock
• Rim lock

Rationale: Electronic locks allow advanced security features such as

keycards, PINs, or biometric access, making them suitable for high- security applications.

• What is the function of a strike plate?
• To lock the door
• To reinforce the door frame and receive the latch or bolt
• To prevent door warping
• To secure hinges 2 / 3

Rationale: The strike plate is mounted on the door frame to receive the

latch or bolt and provide reinforcement.

• Which key is designed to open only one lock?
• Master key
• Sub-master key
• Change key
• Skeleton key

Rationale: Change keys are specific to a single lock, unlike master

keys which operate multiple locks.

• What is the typical function of a deadbolt?
• To allow automatic locking
• To secure cabinets
• To provide strong resistance against forced entry
• To control door swing

Rationale: Deadbolts extend a solid bolt into the door frame,

providing strong protection against forced entry.

• Which type of hinge allows a door to pivot completely out of its

frame?

• Butt hinge
• Continuous hinge
• Removable pin hinge
• Concealed hinge

Rationale: Removable pin hinges allow the door to be removed easily

by taking out the hinge pins.

• What is the main advantage of a tubular lock?
• It is very strong
• It uses electronic access
• It is easy to install and cost-effective
• It resists drilling

Rationale: Tubular locks are popular because they are simple to

install, affordable, and commonly used in residential doors.

• What type of lock is commonly found on filing cabinets?
• Deadbolt
• Rim lock
• Cam lock
• Mortise lock
• / 3