Which material is used to insulate the commutator segments in a DC generator?
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A.
Rubber
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B.
Mica
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C.
Fiberglass
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D.
Plastic
Correct Answer:
B. Mica
Explanation:
Mica is the primary material used for insulating commutator segments in a DC generator because of its exceptional electrical and thermal properties. As a high-quality insulator with significant dielectric strength, mica prevents electrical short circuits between the copper segments even under high voltage. Additionally, it can withstand the intense heat generated by continuous friction and current reversal during operation, ensuring the commutator remains stable and durable over time. While other materials like plastics may be used in smaller machines, mica remains the standard for industrial and high-voltage applications due to its reliability and heat resistance.
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