9. In a permanent magnet de motor which of the following methods of speed control can not be used? Options: A . &nbsparmature voltage variation B . &nbsparmature resistance control C . &nbspfield current variation D . &nbspall of these

9. In a permanent magnet de motor which of the following methods of speed c

Question - 9. In a permanent magnet de motor which of the following methods of speed control can not be used?

Options:

A . armature voltage variation

B . armature resistance control

C . field current variation

D . all of these

Answer: Option C

Submit Your Solution Below and Earn Points !

Next Question