CFAA Fire Alarm Technician · Question
If the light beam of a projected beam smoke detector is 90% or more obscured for more than 5 seconds, what signal must be initiated?
Beam detectors must be monitored for 'obscuration'. If the light is blocked (not just smoke, but a solid object), the system must register a trouble signal.
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Question: If the light beam of a projected beam smoke detector is 90% or more obscured for more than 5 seconds, what signal must be initiated?
Answer options: ✅ Trouble Signal
- Fire Alarm Signal
- Supervisory Signal
- Ancillary Function Signal
Correct answer: Trouble Signal
Explanation: Beam detectors must be monitored for 'obscuration'. If the light is blocked (not just smoke, but a solid object), the system must register a trouble signal.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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