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Metropolitan Transportation Authority (MTA) Electrical Practice Test

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Which term refers to a third winding on a transformer used as a second control winding?
Correct Answer:
Tertiary Winding
Explanation:
In transformers, you can add an extra winding beyond the primary and secondary. That third winding is called a tertiary winding. It serves as an auxiliary or control winding, providing power for control circuitry or biasing while keeping it isolated from the main power path. This makes it ideal for supplying a second control circuit or feedback without loading the main secondary. The other terms don’t fit because they aren’t windings on a transformer: a transformer is the device itself, a thermistor is a temperature‑dependent resistor, and a servo is a motor/actuator.

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