railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines Alternator and Synchronous Motors Synchronous Motor changing Excitation Effect
Under constant mechanical load, changing the excitation of a synchronous motor affects which of the following?
I. Power factor
II. Armature current magnitude
III. Speed of the motor IV. Real power output
1
I and IV only
2
I and II only
3
II and III only
4
III and IV only