Answer :
Final answer:
Option 2 is correct.
The three types of heat detectors in a fire alarm system are Rate-of-Rise, Fixed Temperature, and Thermocouple detectors.
Explanation:
In a fire alarm system, the three types of heat detectors are:
Rate-of-Rise detectors: These detectors sense a rapid increase in temperature.
Fixed Temperature detectors: These detectors trigger an alarm when the temperature reaches a specific set point. Thermocouple detectors: These detectors use a pair of dissimilar metals that generate a voltage signal when heated, indicating a rise in temperature.
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