A. sludge
B. odour
C. gases
D. moisture
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A transformer oil must be free from moisture.
A. Sludge: Sludge is solid particles that can form in transformer oil due to heat and aging. It can cause damage to the transformer and reduce its efficiency, but it does not directly affect the oil itself.
B. Odour: The oil should not have any bad smell, but it is not a critical concern for the oil’s functionality.
C. Gases: The oil should not have any dissolved gases, but it is not a critical concern for the oil’s functionality.
D. Moisture: Moisture can cause corrosion and damage to the transformer and reduce its efficiency. It can also cause the oil to break down and lose its insulating properties. It is important that the transformer oil is properly sealed and maintained to prevent moisture from getting in