Discussion
Where is class C used?
Answer: B
Class C conducts for well under half a cycle and is grossly non-linear, so it is usable only where a tuned circuit restores the sine wave from the pulses it delivers - which means constant-envelope radio transmission. Audio, instrumentation and preamplifier stages all need linearity. That an amplifier can be useful while distorting badly, provided a filter follows it, is worth understanding, since the same idea underlies the switching classes. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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