CFAA Fire Alarm Technician · Question
According to NFPA 72, which metric is used to measure the clarity of a voice evacuation signal?
NFPA 72 defines the Common Intelligibility Scale (CIS) or STI (Speech Transmission Index) which are the technical metrics used for fire alarm voice systems.
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Question: According to NFPA 72, which metric is used to measure the clarity of a voice evacuation signal?
Answer options: ✅ STI (Speech Transmission Index)
- Decibel Watts per Meter
- Frequency modulation factor (FMF)
- Signal-to-Noise Ratio (SNR) solely
Correct answer: STI (Speech Transmission Index)
Explanation: NFPA 72 defines the Common Intelligibility Scale (CIS) or STI (Speech Transmission Index) which are the technical metrics used for fire alarm voice systems.
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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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