| When installing a mechanical shaft seal on a refrigeration compressor, extreme care must be taken to prevent what from happening? |
| A) dirt and foreign particles from coming in contact with the highly polished sealing surfaces |
| B) any lubricant from contacting the carbon surface that would cause the expulsion of the saturated Teflon film |
| C) any lubricant from contacting the stationary seal face that would cause etching of the face surface |
| D) the spring from being damaged by the corrosive effects of excessive handling |
