Electrician Red Seal · Question
An autotransformer is often used in reduced-voltage motor starters. How does it differ from a standard isolation transformer?
An autotransformer consists of a single, continuous winding with taps. Part of this single winding acts as the primary, and the entire winding or another part o
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Question: An autotransformer is often used in reduced-voltage motor starters. How does it differ from a standard isolation transformer?
Answer options:
- It uses air as a core material.
- It has no electrical connection between the primary and secondary windings. ✅ It has only one winding, which serves as both the primary and secondary.
- It can only be used for stepping voltage up.
Correct answer: It has only one winding, which serves as both the primary and secondary.
Explanation: An autotransformer consists of a single, continuous winding with taps. Part of this single winding acts as the primary, and the entire winding or another part of it acts as the secondary, meaning there is no electrical isolation between the two sides.
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