Autotransformer Definition Check Evaluate the statement: “An autotransformer is one in which the primary and secondary are automatically coupled.”

Introduction / Context:
Autotransformers are frequently used for voltage adjustment with higher efficiency and smaller size than two-winding transformers. The word “auto” often leads to a misunderstanding that they are “automatic;” in fact, it means “self.”

Given Data / Assumptions:

• Conventional single-winding autotransformer topology.
• Shared winding section between input and output.
• Sinusoidal AC operation.

Concept / Approach:

An autotransformer has a single continuous winding with one or more taps. Primary and secondary are portions of the same winding, so they are electrically connected (not isolated). The term does not mean “automatically coupled;” it means “self-transformer,” i.e., one winding serving both functions.

Step-by-Step Solution:

Verification / Alternative check:

Manufacturer datasheets state “single winding” and highlight lack of isolation as a caution, confirming the definition.

Why Other Options Are Wrong:

Any “True …” option relies on the wrong etymology. Frequency or turns ratio does not change the fact that “auto” means self, not automatic.

Common Pitfalls:

Assuming autotransformers provide isolation like two-winding transformers; they do not. Isolation requires separate windings.

Final Answer:

False