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A sudden increase in the amount of moisture or oil drained from any air-tank:

  1. Is normal during cold weather

  2. Must be reported and repaired

  3. Indicates high usage

  4. None of the above

The correct answer is: Must be reported and repaired

A sudden increase in the amount of moisture or oil drained from an air-tank may indicate a potential problem within the system. It could be an indication of leaks, damage, or excessive wear and tear. As such, it is important to report and repair this issue promptly to prevent any further damage or potential safety hazards. Options A and C are incorrect because they suggest that such an increase is normal or expected, which is not necessarily the case. Option D is also incorrect because the issue should not be ignored and requires attention from a maintenance professional. Therefore, option B is the most appropriate choice as it emphasizes the importance of addressing the issue.