Answered

The following statements explain why a synchronous motor could never be started with DC excitation applied to the rotor, except:

A. The power supply could be damaged.
B. The motor will run at a higher current.
C. The rotor could be damaged.
D. The motor will not run.



Answer :

GinnyAnswer

Final answer:

A synchronous motor cannot be started with DC excitation due to potential damage to the power supply, higher current consumption, possible rotor damage, and inefficient operation.


Explanation:

A synchronous motor could never be started with DC excitation applied to the rotor due to various reasons:

  1. The power supply could be damaged due to the high current drawn initially.
  2. The motor will run at a higher current when started with DC excitation.
  3. The rotor could be damaged if started with DC excitation.
  4. The motor will not run smoothly and efficiently if started with DC excitation.

These issues arise because DC excitation does not allow for the back emf to be generated properly in the motor, affecting its performance.


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