Terminology check – What is an alternator? Statement: “An alternator is an electromechanical AC generator.” Indicate whether the statement is correct.

Introduction / Context:
“Alternator” is a foundational term in power engineering and automotive systems. Knowing precisely what an alternator is—and is not—ensures clarity when discussing generation, rectification, and system integration.

Given Data / Assumptions:

• An electromechanical device converts mechanical power to electrical power.
• Alternators produce alternating current at their terminals.
• External rectifiers may convert AC to DC for specific applications (e.g., vehicles).

Concept / Approach:

An alternator is a synchronous AC generator: a rotating field (DC-excited or permanent magnet) induces AC in stationary stator windings. While automotive alternators include rectifier bridges to supply DC to the battery, the machine itself generates AC, confirming the definition in the statement.

Step-by-Step Solution:

Verification / Alternative check:

Textbook classifications: DC generator vs. AC generator (alternator). Manufacturer datasheets refer to synchronous generators as alternators for AC output.

Why Other Options Are Wrong:

Claiming it produces DC conflates the machine with downstream rectification. Limiting to single-phase is wrong; alternators are commonly three-phase for power quality and efficiency.

Common Pitfalls:

Equating the electrical output after rectification (DC) with the machine type; always differentiate machine output from system-level conditioning.

Final Answer:

True.