Contractor Exam Questions And

CA C28 Lock & Security Equipment Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which type of lock is considered the most secure for residential use?
• Pin tumbler lock
• Wafer lock
• Deadbolt lock
• Cam lock

Rationale: Deadbolt locks provide more resistance to picking and

forced entry compared to other common residential locks.

• What is the primary function of a master key system?
• To prevent unauthorized access
• To allow different levels of access with one key
• To replace electronic locks
• To increase lock durability

Rationale: Master key systems allow multiple locks to be operated by

different keys while enabling a single key to access all locks in the system.

• Which material is commonly used for high-security lock cylinders?
• Plastic
• Aluminum
• Brass
• Hardened steel

Rationale: Hardened steel resists drilling and physical attacks,

making it ideal for high-security applications. 1 / 3

• What does ANSI/BHMA Grade 1 certification indicate?
• The lock is decorative
• The lock is for residential use only
• The lock meets the highest standard for security and durability
• The lock is electronic

Rationale: ANSI/BHMA Grade 1 is the highest rating for commercial

locks, ensuring maximum durability and security.

• Which type of lock is most vulnerable to lock bumping?
• Deadbolt lock
• Pin tumbler lock
• Magnetic lock
• Lever handle lock

Rationale: Standard pin tumbler locks are susceptible to bumping

unless they have anti-bump features.

• In an electronic access control system, what does an RFID reader do?
• Reads credentials wirelessly
• Opens the lock manually
• Powers the system
• Monitors battery life

Rationale: RFID readers use radio frequency to read credentials

(cards, fobs) without physical contact.

• Which type of keyway provides the most resistance to unauthorized

duplication?

• Standard keyway
• Restricted keyway
• Wafer keyway
• Skeleton keyway

Rationale: Restricted keyways are patented or proprietary, limiting

the ability to duplicate keys without authorization.

• Which is the primary advantage of a cylindrical lock over a mortise

lock?

• Higher security
• Lower cost
• Easier installation
• Better fire resistance

Rationale: Cylindrical locks are simpler to install and replace

compared to mortise locks, which require precise door preparation. 2 / 3

• What is the recommended torque setting for installing a heavy-duty

deadbolt?

• 10–15 in-lbs
• 20–25 in-lbs
• 30–35 in-lbs
• 50–60 in-lbs

Rationale: Correct torque ensures proper operation without

damaging the lock mechanism.

• What is the main purpose of a strike plate?
• To lock the door automatically
• To provide decorative finish
• To hold the key in place
• To reinforce the door frame for the lock bolt

Rationale: Strike plates distribute the force of the bolt, increasing

resistance to forced entry.

• Which type of lock is commonly used in commercial panic

hardware?

• Pin tumbler lock
• Exit device (panic bar)
• Cam lock
• Combination lock

Rationale: Exit devices allow doors to open quickly in emergencies

while maintaining security from the outside.

• Which locksmith tool is specifically designed for decoding

combination locks?

• Pick set
• Tension wrench
• Dial gauge
• Plug spinner

Rationale: A dial gauge helps detect the correct combination by

measuring subtle mechanical feedback.

• What is the standard backset for most residential locks in the

U.S.?

• 2 inches
• 2.25 inches
• 2.75 inches
• 3 inches
• / 3