When replacing a defective transformer in a paralleled transformer configuration, which of the following actions must be carried out to insure proper operation of the equipment it serves?

Correct Answer: Option B — The transformer connections must be made as before with regard to the indicated polarity.

Paralleled transformers must match in polarity, voltage ratio, and impedance to prevent massive circulating currents and short circuits. Proper operational phase-angle relationship is strictly verified by adhering to original connection polarities.