Discussion
Match each protection scheme with the fault it addresses.
List I
A. V-I limiting
B. Output relay
C. Emitter ballast
List II
P. A short across the output
Q. Direct voltage reaching the speaker
R. Unequal sharing between paralleled devices
Select the correct match.
Answer: B
The pairing is A-P, B-Q, C-R. Three schemes addressing three quite different failures, one protecting the amplifier from the user, one protecting the load from the amplifier, and one protecting the devices from each other. A practical output stage carries all three, and recognising which fault each covers explains why none of them can be omitted as redundant.
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