CDC Power Pro Practice Test 2025 - Free CDC Practice Questions and Study Guide

Question: 1 / 400

How many degrees apart are the phase windings positioned in a three-phase alternator?

120

In a three-phase alternator, the phase windings are designed to be spaced evenly around the rotor to create a balanced three-phase system. The standard angular separation between each of the phase windings is 120 degrees. This configuration allows for the generation of three alternating currents that are offset in time by one-third of a cycle (120 degrees).

This 120-degree separation is essential for maintaining the uniformity of voltage and power output across the three phases, ensuring that the system operates efficiently. In such a setup, as one winding reaches its peak voltage, the other two windings are at specific points along their cycles, which contribute to the overall smooth power delivery.

The other options involve angles that do not correctly reflect the required separation for a balanced three-phase system. Hence, they do not satisfy the design principles necessary for effective alternator operation.

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