Question: 19 Multiple Choice 2 points Stack switch operation? Monitors pressure O Measures airflow Senses stack temperature O Detects light from flame 20 Multiple Choice 2

19 Multiple Choice 2 points Stack switch operation? Monitors pressure O Measures airflow Senses stack temperature O Detects light from flame 20 Multiple Choice 2 points Direct ignition types? Spark and glow coil O Spark and thermocouple O Thermocouple and glow coil Spark and hot surface 21 Multiple Choice 2 points Which of the following is the most popular medium used to transfer heat in residential structures? O Water O Steam O Air 23 Multiple Choice 2 points Function of an oil burner primary control? O Monitor exhaust O Supervise burner operation O Measure fuel levels O Control airflow 24 Multiple Choice 2 points Material in hot surface igniters? Crystallized sulfur Silicon-coated steel Silicon carbide Silicon

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