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Intrusion Detection & Monitoring Flashcards

7 cards from real CST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which type of motion sensor is best suited for detecting intruders in environments with large temperature fluctuations?

    Answer: Dual-technology (PIR + microwave)

    Dual-technology sensors combine PIR and microwave detection, reducing false alarms caused by temperature changes that would trigger a PIR-only sensor.

  2. In intrusion detection systems, what does the term 'cross-zoning' refer to?

    Answer: Requiring two separate zones to alarm before triggering a response

    Cross-zoning requires activation of two independent detection zones to confirm an intrusion before generating an alarm, significantly reducing false alarm rates.

  3. A glass break detector set to 'wideband' mode will respond to which frequency range?

    Answer: Both flex and shatter frequencies

    Wideband glass break detectors monitor both the low-frequency flex sound and the high-frequency shatter sound to confirm actual glass breakage.

  4. What is the primary purpose of a 'supervised' intrusion detection circuit?

    Answer: To continuously verify circuit integrity and detect tampering or wiring faults

    Supervised circuits use end-of-line resistors or active polling to detect open or short circuit conditions, indicating tampering, cut wires, or equipment failure.

  5. During system commissioning, a PIR detector repeatedly triggers false alarms near a south-facing window. The most likely cause is:

    Answer: Thermal masking from sunlight heating the detection zone

    Direct sunlight can heat surfaces within the PIR's detection pattern, creating thermal gradients that mimic body heat and trigger false alarms.

  6. An active infrared beam detector generates a fault condition when the receiver signal drops by what typical threshold percentage?

    Answer: 25%

    Most active IR beam detectors are engineered to alarm when received signal strength drops by approximately 25%, balancing sensitivity with immunity to minor obstructions like fog or insects.

  7. Which intrusion detection standard governs the grading of alarm systems for residential and commercial applications in the United States?

    Answer: ANSI/SIA CP-01

    ANSI/SIA CP-01 is the Control Panel Standard that defines false alarm reduction features and grading criteria widely adopted by AHJs across the United States.