ABAT ABAT Sensors, Detectors & Detection Devices

Question 1

What type of motion detector uses both microwave and passive infrared technology to reduce false alarms?

Accepted Answer

Dual-technology (dual-tech) detector

Answer

Dual-technology detectors require both the PIR and microwave sensing channels to trigger simultaneously, dramatically reducing false alarms caused by environmental factors that might fool a single-technology sensor.

Question 2

A passive infrared (PIR) detector senses motion by detecting changes in which physical property?

Accepted Answer

Infrared radiation emitted by moving objects

Answer

PIR detectors are passive (they emit nothing) and detect the change in infrared heat energy emitted by a warm body (such as a person) as it moves through the sensor's detection zones.

Question 3

What is the primary advantage of a recessed door contact over a surface-mount door contact?

Accepted Answer

Concealed installation that is tamper-resistant and aesthetically cleaner

Answer

Recessed door contacts are installed inside drilled holes in the door and frame, making them invisible and much harder for intruders to detect, defeat, or tamper with.

Question 4

Which type of glass break detector analyzes the acoustic frequency profile of breaking glass rather than just sensing vibration?

Accepted Answer

Acoustic glass break detector

Answer

Acoustic glass break detectors use a microphone to analyze the audio spectrum of breaking glass, looking for the specific low-frequency thud followed by high-frequency shatter pattern.

Question 5

A magnetic door contact generates an alarm when the door is opened because the magnet moves away from the reed switch. What is the normal (secured) state of the reed switch contacts?

Accepted Answer

Closed (normally closed / NC)

Answer

Standard alarm door contacts use normally closed (NC) reed switches; when the magnet is close (door shut), the contacts are held closed, and opening the door removes the magnetic field, opening the circuit and triggering an alarm.

ABAT - Advanced Burglar Alarm Technician Certified Practice Test

ABAT - Advanced Burglar Alarm Technician Certified Practice Test

ABAT ABAT Sensors, Detectors & Detection Devices