Moderate
Overheating of relay contacts or contact born out is due to_______________?
Correct answer: D. all of the above
- A. slow making and breaking of load circuit contacts
- B. foreign matter on the contact surface
- C. too low contact pressure
- D. all of the above
Explanation
Slow contact operation prolongs arcing, foreign material raises contact resistance, and insufficient pressure reduces the effective contact area. Each condition can produce overheating or burned relay contacts, so all apply.
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