CST Intrusion Detection & Monitoring 2

Question 1

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

Accepted Answer

Dual-technology (PIR + microwave)

Answer

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

Question 2

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

Accepted Answer

Requiring two separate zones to alarm before triggering a response

Answer

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

Question 3

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

Accepted Answer

Both flex and shatter frequencies

Answer

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

Question 4

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

Accepted Answer

To continuously verify circuit integrity and detect tampering or wiring faults

Answer

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

Question 5

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

Accepted Answer

Thermal masking from sunlight heating the detection zone

Answer

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

(CST) Certified Surveillance Technician Practice Test

(CST) Certified Surveillance Technician Practice Test

CST Intrusion Detection & Monitoring 2