Gas Fitter Practice · Question
Which component is designed to shut off the gas supply if the pilot flame goes out?
Thermocouples and thermopiles generate a millivoltage signal that keeps the pilot gas valve open; loss of flame stops the signal, closing the valve.
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Question: Which component is designed to shut off the gas supply if the pilot flame goes out?
Answer options:
- Gas valve regulator ✅ Thermocouple or thermopile
- Ignition control module
- Main limit switch
Correct answer: Thermocouple or thermopile
Explanation: Thermocouples and thermopiles generate a millivoltage signal that keeps the pilot gas valve open; loss of flame stops the signal, closing the valve.
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