NATE Gas Heating Practice Exam

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Prepare for the NATE Gas Heating Exam with comprehensive flashcards and multiple-choice questions. Each question includes detailed hints and explanations. Boost your confidence and be ready for your certification!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which device is responsible for monitoring the furnace's flame during operation?

High limit switch
Flame sensor
Gas valve
Induced draft blower

The correct answer is: Flame sensor

The flame sensor plays a crucial role in the operation of a furnace by monitoring the presence and stability of the flame during combustion. Its primary function is to detect whether the flame is burning correctly and to ensure it remains lit while the furnace is operating. If the flame goes out or is detected as unsafe, the flame sensor sends a signal to the control board to shut off the gas supply, preventing the risk of a gas leak or explosion. Understanding the importance of a flame sensor highlights why it is integral to both safety and the efficiency of the heating system. It operates in conjunction with other components, but its specific role is to monitor the flame directly, making it essential for safe furnace operation.