One AC cycle is produced by how many degrees of rotation?

One AC cycle is produced by how many degrees of rotation?

• A. 180 degrees
• B. 360 degrees
• C. 90 degrees
• D. 270 degrees

Answer: (B)

A complete AC cycle is a full 360 electrical degrees of phase progression. In a simple two-pole generator, the polarity seen by the stator returns to its starting condition after the rotor makes one full mechanical turn, which is 360 degrees of rotation. So, one full rotation produces one complete sine-wave cycle. If more poles were used, the mechanical degrees per cycle would be 720 divided by the number of poles, but for the common two-pole case, 360 degrees of rotation equals one AC cycle.

A complete AC cycle is a full 360 electrical degrees of phase progression. In a simple two-pole generator, the polarity seen by the stator returns to its starting condition after the rotor makes one full mechanical turn, which is 360 degrees of rotation. So, one full rotation produces one complete sine-wave cycle. If more poles were used, the mechanical degrees per cycle would be 720 divided by the number of poles, but for the common two-pole case, 360 degrees of rotation equals one AC cycle.