Discussion
What does a diode's forward surge rating allow for?
Answer: B
The surge rating covers the large brief current that flows when a discharged filter capacitor is first connected, which can be many times the steady peak. Continuous temperature, reverse transients and the normal peak are all covered by other ratings. Switch-on is a distinct worst case from steady operation, and a supply that runs perfectly can still destroy its rectifier on the first switch-on if this rating was ignored. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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