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In which order should air tanks be drained?

  1. Primary, secondary, wet

  2. Wet, secondary, primary

  3. Secondary, wet, primary

  4. Wet, primary, secondary

The correct answer is: Wet, primary, secondary

Air tanks should be drained in the following order Wet, primary, secondary. This is because the wet tank collects the most moisture and should be drained first to prevent any water from entering the other tanks. Then, the primary tank should be drained as it collects the bulk of the air, followed by the secondary tank. Draining in any other order could potentially cause water to enter the other tanks and affect the performance of the air system. Therefore, option A, B, and C are incorrect as they do not follow the proper order of draining the air tanks.