Consider the following statements and choose the correct option.Statement 1: The speed regulation of a synchronous motor is always unity.Statement 2: In a synchronous motor, at no-load condition, and with normal excitation the armature current drawn by a synchronous motor is in phase with applied voltage.

• A. Statement 1 is TRUE and Statement 2 is FALSE
• B. Both Statement 1 and Statement 2 are TRUE
• C. Statement 1 is FALSE and Statement 2 is TRUE
• D. Both Statement 1 and Statement 2 are FALSE

Answer: (D)

The speed regulation of a motor expresses how much its speed varies between no-load and full load.
The synchronous motor runs at a constant speed whose magnitude is dependent on supply frequency and the number of poles.
Since the speed of the motor is constant hence its speed regulation is zero.
Under no-load conditions with normal excitation, armature current Ia drawn by a synchronous motor lags the applied voltage V by a small angle.