Discussion
What must a direct-coupled amplifier's protection guard against?
Answer: C
Without a coupling capacitor to block it, a shorted output device puts the full rail across the loudspeaker and burns out the voice coil in seconds, which is why a direct-voltage detector and a relay are standard. There is no coupling capacitor to fail, unequal rails shift the operating point without destroying the load, and oscillation is a separate hazard. Removing a component removes its function too, and the protection circuit is what replaces the capacitor's incidental safety.
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