Discussion
Which purpose do the additional field diodes serve?
Answer: A
Once the machine is generating, the field diodes supply the rotor from the output and equalise the potential across the lamp so it goes out. That is why the lamp is part of the excitation circuit rather than merely an indicator. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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