Problem-Solving and Critical Thinking Flashcards

A motion detector repeatedly triggers false alarms only during early morning hours. What is the most likely cause?

Answer: Heating system activating and creating thermal gradients

Passive infrared detectors can trigger false alarms when HVAC systems activate and create rapid temperature changes that mimic motion.

A customer reports that their alarm system shows a 'comm failure' trouble condition. What should be checked first?

Answer: Verify that the telephone line or network connection is active and properly connected

A communication failure trouble typically indicates a problem with the communication pathway, so verifying connectivity is the logical first step.

When troubleshooting an alarm system, you find that one zone is always in alarm even after bypassing it. What does this suggest?

Answer: The zone wiring has a short to ground creating a fault condition

A zone that cannot be cleared even after bypassing indicates a wiring fault such as a short circuit rather than a sensor issue.

A technician discovers two alarm systems installed in the same building by different contractors, and both systems are causing interference with each other. What is the best resolution?

Answer: Coordinate frequencies and communication paths so the systems do not conflict

Coordinating frequencies, communication channels, and signal paths eliminates interference while allowing both systems to function properly.

A glass break detector in a retail store triggers every time a forklift operates nearby. What corrective action should be taken?

Answer: Relocate the detector or adjust sensitivity to reduce susceptibility to low-frequency vibration

Adjusting sensitivity or relocating the detector away from the vibration source will reduce nuisance alarms without compromising security.

During a routine inspection, a technician finds a smoke detector that was painted over by building maintenance. What is the correct action?

Answer: Document and replace the detector, as paint can clog sensing chambers and impair function

Paint can block the detector's sensing chamber, preventing proper smoke detection, so the unit must be replaced to ensure life-safety compliance.

A newly installed wireless door contact fails to communicate reliably with the receiver. Walking the RF path shows signal drops in one hallway. What is the best solution?

Answer: Install a wireless repeater in the area with poor signal coverage

A wireless repeater extends RF coverage in areas with obstructions or distance limitations, resolving communication gaps without rewiring.