Locksmith Security Systems 2

Question 1

What does a passive infrared (PIR) motion detector primarily sense?

Accepted Answer

Changes in infrared radiation emitted by warm bodies

Answer

PIR detectors sense changes in infrared energy radiated by warm-bodied intruders moving through the detection zone.

Question 2

A dual-technology motion detector combines PIR with which second technology to reduce false alarms?

Accepted Answer

Microwave

Answer

Dual-tech detectors pair PIR with microwave sensing and only trigger when both technologies detect motion simultaneously.

Question 3

Which door contact type is considered tamper-resistant because it requires the magnet to be removed before the alarm triggers?

Accepted Answer

Recessed contact

Answer

Recessed contacts are embedded in the door and frame, making them harder to defeat with an external magnet.

Question 4

What is the purpose of an End-of-Line (EOL) resistor in an alarm circuit?

Accepted Answer

To allow the panel to supervise the circuit for cuts and shorts

Answer

An EOL resistor lets the panel continuously monitor the zone circuit, detecting open (cut) or short conditions as separate alarm states.

Question 5

What type of alarm contact is wired so that removing the magnet closes the circuit and triggers the alarm?

Accepted Answer

Normally open (NO)

Answer

A normally open contact completes (closes) the circuit when the door opens, signaling the alarm panel.

Locksmith Practice Test