Engine : General Subjects - 282/1128
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| Mechanical shaft seals used on water service pumps require lubrication of the seal faces to minimize deposits of foreign matter on those surfaces. Which of the following pressures and lubricants are required? |
| A) Water under negative pressure. |
| B) Water under positive pressure. |
| C) Oil under positive pressure. |
| D) Oil under negative pressure. |
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