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What is a cause of generator brush arcing?
High voltage
Low spring tension
Excessive humidity
Improper installation
The correct answer is: Low spring tension
Generator brush arcing is caused by low spring tension. High voltage is not a cause of generator brush arcing, as it is the current that causes the arcing. Excessive humidity can result in corrosion of the brushes, but it is not a direct cause of arcing. Improper installation could potentially cause brush arcing, but it is not a common cause and typically indicates other issues with the generator. This could include low spring tension, worn brushes, or other factors.