Question

When a synchronous motor is operating at normal excitation, its operating power factor is:

• A. Lagging
• B. Leading
• C. Unity
• D. Zero

Hint:

At normal excitation, a synchronous motor operates at unity power factor, where the current and voltage are in phase, and it neither absorbs nor supplies reactive power.

Answer 1

The Correct Option is C

A synchronous motor, when operating at normal excitation (also known as rated excitation), operates at a power factor of unity. This means that the current and voltage are in phase, and the motor is neither consuming reactive power (lagging) nor supplying reactive power (leading). Thus, the operating power factor of a synchronous motor at normal excitation is unity.