CO Security Systems Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a security system’s control panel?
A. To provide backup lighting
B. To store surveillance video only
C. To receive, process, and respond to signals from security devices
D. To supply telephone service
Rationale: The control panel is the central processing unit of an
electronic security system. It receives signals from devices such as
door contacts, motion detectors, glass-break sensors, and panic
devices, evaluates those signals according to programmed rules, and
activates appropriate outputs such as alarms, notifications, or access-
control functions.
, 2. Which device is commonly used to detect the opening of a
protected door or window?
A. PIR detector
B. Smoke detector
C. Magnetic contact
D. Strobe light
Rationale: A magnetic contact consists of a switch and magnet that
operate together when the protected opening is closed. Separating
the two changes the electrical state of the circuit, allowing the control
panel to recognize that the door or window has been opened.
3. What does PIR stand for in security detection equipment?
A. Power Isolation Relay
B. Passive Infrared
C. Primary Input Receiver
D. Programmable Interface Relay
Rationale: PIR stands for Passive Infrared. A PIR motion detector
senses changes in infrared radiation, commonly caused when a person
moves across different zones within the detector’s field of view.
4. Which condition is most likely to cause a PIR motion detector to
generate a false alarm?
,A. A properly secured junction box
B. A closed magnetic contact
C. Significant temperature changes or moving heat sources
D. A properly grounded control panel
Rationale: PIR detectors respond to changes in infrared energy.
Heating and cooling equipment, direct sunlight, rapidly changing
temperatures, or other moving heat sources can produce conditions
that resemble human movement and may cause nuisance alarms.
5. What is the main purpose of an end-of-line resistor in a
supervised security circuit?
A. To increase speaker volume
B. To provide surge protection only
C. To allow the control panel to monitor the circuit for certain open or
short conditions
D. To convert AC power into DC power
Rationale: An end-of-line resistor establishes a known electrical
condition that the control panel expects to see. If the wiring is cut,
shorted, or otherwise altered, the resistance changes and the panel
can identify a trouble or alarm condition depending on the circuit
design.
, 6. Which type of circuit monitoring provides the greatest ability to
distinguish normal, alarm, and tamper conditions?
A. Unsupervised circuit
B. Open-only circuit
C. Multiple-state supervised circuit
D. Shorted circuit
Rationale: A properly designed multi-state supervised circuit can
provide separate electrical conditions corresponding to normal
operation, alarm, and trouble or tamper states. This gives the control
panel more information than a simple unsupervised loop.
7. What is the purpose of a security system backup battery?
A. To increase detector sensitivity
B. To eliminate the need for AC power
C. To maintain system operation when the primary AC power source
fails
D. To provide additional telephone lines
Rationale: Security systems normally use a primary power source,
often utility AC power with a power supply and charger. A
rechargeable standby battery maintains operation during an AC
power failure, subject to its capacity and the system load.
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a security system’s control panel?
A. To provide backup lighting
B. To store surveillance video only
C. To receive, process, and respond to signals from security devices
D. To supply telephone service
Rationale: The control panel is the central processing unit of an
electronic security system. It receives signals from devices such as
door contacts, motion detectors, glass-break sensors, and panic
devices, evaluates those signals according to programmed rules, and
activates appropriate outputs such as alarms, notifications, or access-
control functions.
, 2. Which device is commonly used to detect the opening of a
protected door or window?
A. PIR detector
B. Smoke detector
C. Magnetic contact
D. Strobe light
Rationale: A magnetic contact consists of a switch and magnet that
operate together when the protected opening is closed. Separating
the two changes the electrical state of the circuit, allowing the control
panel to recognize that the door or window has been opened.
3. What does PIR stand for in security detection equipment?
A. Power Isolation Relay
B. Passive Infrared
C. Primary Input Receiver
D. Programmable Interface Relay
Rationale: PIR stands for Passive Infrared. A PIR motion detector
senses changes in infrared radiation, commonly caused when a person
moves across different zones within the detector’s field of view.
4. Which condition is most likely to cause a PIR motion detector to
generate a false alarm?
,A. A properly secured junction box
B. A closed magnetic contact
C. Significant temperature changes or moving heat sources
D. A properly grounded control panel
Rationale: PIR detectors respond to changes in infrared energy.
Heating and cooling equipment, direct sunlight, rapidly changing
temperatures, or other moving heat sources can produce conditions
that resemble human movement and may cause nuisance alarms.
5. What is the main purpose of an end-of-line resistor in a
supervised security circuit?
A. To increase speaker volume
B. To provide surge protection only
C. To allow the control panel to monitor the circuit for certain open or
short conditions
D. To convert AC power into DC power
Rationale: An end-of-line resistor establishes a known electrical
condition that the control panel expects to see. If the wiring is cut,
shorted, or otherwise altered, the resistance changes and the panel
can identify a trouble or alarm condition depending on the circuit
design.
, 6. Which type of circuit monitoring provides the greatest ability to
distinguish normal, alarm, and tamper conditions?
A. Unsupervised circuit
B. Open-only circuit
C. Multiple-state supervised circuit
D. Shorted circuit
Rationale: A properly designed multi-state supervised circuit can
provide separate electrical conditions corresponding to normal
operation, alarm, and trouble or tamper states. This gives the control
panel more information than a simple unsupervised loop.
7. What is the purpose of a security system backup battery?
A. To increase detector sensitivity
B. To eliminate the need for AC power
C. To maintain system operation when the primary AC power source
fails
D. To provide additional telephone lines
Rationale: Security systems normally use a primary power source,
often utility AC power with a power supply and charger. A
rechargeable standby battery maintains operation during an AC
power failure, subject to its capacity and the system load.
