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What are the primary causes of electrical breakdown in gaseous insulators?
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State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials.
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Describe with reasons the failure of porcelain insulators.
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Why are alloys (like steel or bronze) used in engineering instead of pure metals?
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What is meant by "harmonics" in an electrical system and what problems can they cause?

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What are ohmic and non-ohmic resistors? Give one example of each?
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