How does the flame rod sense the flames in a flame rectification circuit?

A) The flame rod expands from being heated, making a mechanical switch at its base
B) The flame rod is made of a semiconductor material that acts as a silicon controlled rectifier when it is hot
C) The resistance of the flame rod changes when heated by the flame
D) The flame changes the AC voltage to pulsed DC current


D

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Fill in the blank(s) with the appropriate word(s).

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Hazardous (classified) locations divide atmospheric identifications for Class I, Divisions 1 and 2, locations into ____.

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A wide band oxygen sensor was first used on a Honda in what model year?

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