Question 406Electricity & Electronics - QMED

The correct answer is A) two sets of normally closed contacts which open when the trouble relay coil is energized. This is the correct answer because trouble relay contacts are typically designed to be normally closed, meaning the contacts are closed when the relay is not energized. When the trouble relay coil is energized, indicating a problem or "trouble" condition, the normally closed contacts will open to signal this issue. The other answer choices are incorrect because they do not accurately describe the typical behavior of trouble relay contacts. Trouble relays are not designed to have normally open contacts that close when energized, as that would not effectively signal a trouble condition.