How does the pilot know if the prop amps are operational?

The correct indication of the operational status of the prop amps is connected to the readings observed in relation to the total amps. When the total amps are high, it reflects a greater demand on the electrical system. If the prop amps are functioning properly, their readings will not be zero; rather, they will indicate an output that corresponds to the operational load. If the total amps are indeed high but the prop amps read zero, this indicates that the prop amps may not be operational, hence confirming their status through observation.

Other options may suggest methods of checking the operational status, but they do not provide the same clear and direct confirmation as the correlation between high total amps and the prop amps reading. If the prop amps are operational, their readings should align with the expectations based on the load. Thus, this method of validation using total amps provides a reliable means to ascertain the proper function of the prop amps.