Contractor Exam Questions And

CA D67 Low-Voltage Fire Alarm Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the primary purpose of a fire alarm system?
• To detect burglaries
• To detect fires and alert occupants
• To control building lighting
• To regulate HVAC systems
• To detect fires and alert occupants

Rationale: The main purpose of a fire alarm system is to detect fire-related

hazards early and provide warnings to occupants to facilitate safe evacuation.

• Which component of a fire alarm system senses smoke or heat?
• Control panel
• Notification appliance
• Initiating device
• Power supply
• Initiating device

Rationale: Initiating devices, such as smoke detectors and heat detectors,

sense fire conditions and trigger the alarm system.

• What is the maximum spacing for a ceiling-mounted smoke detector in

a standard room according to NFPA 72? 1 / 3

• 10 feet
• 30 feet
• 50 feet
• 75 feet
• 30 feet

Rationale: NFPA 72 specifies that ceiling-mounted smoke detectors should

generally be spaced no more than 30 feet apart to ensure adequate coverage.

• Which voltage class does a low-voltage fire alarm system typically

use?

A. 120 V AC

B. 240 V AC

C. 24 V DC

D. 480 V AC

C. 24 V DC

Rationale: Low-voltage fire alarm systems commonly operate on 24 volts

DC for safety and compatibility with signaling devices.

• What is the purpose of a notification appliance in a fire alarm system?
• To detect smoke
• To alert occupants of a fire
• To control the HVAC
• To reset the system
• To alert occupants of a fire

Rationale: Notification appliances such as horns, bells, and strobes alert

building occupants when the fire alarm is activated.

• Which standard governs fire alarm system installation in the United

States?

• NEC Article 250

B. NFPA 72

C. OSHA 1910

D. ANSI Z535 2 / 3

B. NFPA 72

Rationale: NFPA 72 is the National Fire Alarm and Signaling Code that

sets standards for the design, installation, and maintenance of fire alarm systems.

• In a conventional fire alarm system, what does each zone represent?
• A separate building
• A group of initiating devices
• A type of notification appliance
• The control panel location
• A group of initiating devices

Rationale: Each zone in a conventional system groups initiating devices to

identify the general location of a fire.

• What is the primary difference between conventional and addressable

fire alarm systems?

• Voltage used
• Device color
• Ability to identify individual devices
• Power supply type
• Ability to identify individual devices

Rationale: Addressable systems can identify the exact device that triggered

the alarm, whereas conventional systems only indicate the zone.

• Which component provides backup power to a fire alarm system during

a power outage?

• Battery
• Transformer
• Relay
• Resistor
• Battery

Rationale: Batteries in fire alarm systems ensure operation during power

failures, maintaining system reliability.

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