Discussion
Why does transformer coupling raise a class A stage's efficiency?
Answer: D
A transformer's winding has negligible resistance, so the collector sits at the supply and can swing to nearly twice it, doubling the available swing for the same current. Impedance matching is a real benefit but a separate one, the conduction angle is unchanged, and the quiescent current still has to flow. Removing a standing voltage drop is a recurring way to improve efficiency, and it is why choke and transformer loads appear wherever supply voltage is scarce.
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