Discussion
Why is class A operation inefficient?
Answer: D
The quiescent current flows continuously, so the device dissipates its maximum with no output at all, and efficiency rises only as the signal approaches full swing. Device size and bias current are consequences rather than causes, and no transformer is necessarily involved. A stage that consumes the same power whether or not it is doing anything is inefficient by construction, which is why class B displaced it in output stages. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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