A 3-phase synchronous motor connected to an infinite bus is operating at half-full load with normal excitation. When the load on the synchronous motor is suddenly increased
A. its speed will first decrease and then become synchronous.
B. its speed will first increase and then become synchronous.
C. its speed will fluctuate around synchronous speed and then become synchronous.
D. its speed will remain unchanged.. [I.E.S. E.E-II, 1994]
Answer:C
A 3-phase synchronous motor connected to an infinite bus is operating at half-full load with normal excitation. When the load on the synchronous motor is suddenly increased
A. its speed will first decrease and then become synchronous. B. its speed will first increase and then become synchronous. C. its speed will fluctuate around synchronous speed and then become synchronous. D. its speed will remain unchanged.. [I.E.S. E.E-II, 1994]