Lock Installation & Maintenance Flashcards
7 cards from real CPL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Lock Installation & Maintenance flashcards as text
Which type of door closer adjustment controls how quickly the door moves during the final few degrees of closing (latching)?
Answer: Latch speed adjustment
The latch speed (final closing) adjustment on a door closer controls the speed of door travel in the last few degrees before the latch engages.
When maintaining an exit device (panic bar), what component should be inspected for wear that could prevent proper latching?
Answer: The latch bolt and dogging mechanism
The latch bolt and dogging mechanism on exit devices are subject to heavy use and must be inspected for wear that could prevent proper latching or unlatching.
A commercial door lock fails a pull test because the lock body moves when force is applied. What is the MOST likely cause?
Answer: Loose or inadequate fasteners securing the lock to the door
Movement of the lock body under pull force indicates loose or inadequate fasteners, which must be corrected to ensure the lock provides its rated security.
What is the function of the 'anti-drill' plate found in some high-security lock cylinders?
Answer: Protects against drilling attacks by containing hardened steel inserts
Anti-drill plates contain hardened steel pins or inserts that cause drill bits to skip and wear out, protecting the cylinder from drilling attacks.
When installing an electric strike, what is the purpose of the 'fail-safe' vs. 'fail-secure' configuration?
Answer: Fail-safe unlocks on power loss; fail-secure locks on power loss
Fail-safe electric strikes unlock (allow egress) when power is lost, while fail-secure strikes remain locked during power failure, each serving different life-safety and security needs.
During routine maintenance on a key-in-knob lock, a technician finds the spindle is worn and slipping. What is the appropriate repair?
Answer: Replace the spindle or the entire lockset if spindle is not available separately
A worn spindle that slips cannot reliably operate the latch and must be replaced; if the spindle is not available separately, lockset replacement is appropriate.
What is the purpose of a 'door silencer' (rubber bumper) installed on a door frame or strike plate?
Answer: Cushions door contact to reduce noise and prevent door frame damage
Door silencers are small rubber bumpers that cushion the door's contact with the stop molding, reducing noise and protecting both the door and frame from impact damage.