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Author Question: Hot-surface ignition units: A) Operate for only a few minutes per day. B) Are standard ignition ... (Read 58 times)

anjilletteb

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on: Jul 27, 2018
Hot-surface ignition units:
 
  A) Operate for only a few minutes per day. B) Are standard ignition systems.
  C) Substantially increase an electric bill. D) Are powered by 220 V.

Question 2

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.


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Juro

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Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

A


anjilletteb

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

Perkypinki

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Reply 3 on: Yesterday
Excellent

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