| 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? |
| A) The secondary leads must be grounded for 10 minutes to remove static charges. |
| B) The transformer connections must be made as before with regard to the indicated polarity. |
| C) The iron core of the transformer must be flashed to pre-magnetize it. |
| D) The iron core must be grounded for 10 minutes to remove any residual magnetism. |
