If Excitation of synchronous generator fails, it acts as a
- A. Synchronous motor
- B. Induction motor
- C. Synchronous generator
- D. Induction generator
Answer: D. Induction generator
Explanation: When the field excitation of a grid-connected synchronous generator fails, the rotor slips below synchronous speed and operates as an induction generator, drawing reactive power from the grid for excitation.