How does the flame rod sense the flames in a flame rectification circuit?
A) The flame changes the AC voltage to pulsed DC current.
B) The resistance of the flame rod changes when heated by the flame.
C) The flame rod expands from being heated, making a mechanical switch at its base.
D) The flame rod is made of a semiconductor material that acts as a silicon controlled rectifier when it is hot.
A
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Indicate whether the statement is true or false