A three phase synchronous generator is operating at 0.8 pf lagging with respect to excitation voltage. Nature of armature reaction mmf produced by the armature current is
- A. magnetising
- B. demagnetising
- C. cross-magnetising
- D. partly demagnetising and partly cross magnetising
Answer: D. partly demagnetising and partly cross magnetising
Explanation: At lagging power factor, synchronous generator armature reaction produces both direct-axis demagnetising and quadrature-axis cross-magnetising effects.