Consider a separately-excited dc motor. Describe the speed varia

Consider a separately-excited dc motor. Describe the speed varia

Consider a separately-excited dc motor. Describe the speed variation of the motor operating unloaded under the following conditions:
a. The armature terminal voltage is varied while the field current is held constant.
b. The field current is varied while the armature terminal voltage is held constant.
c. The field winding is connected in shunt directly to the armature terminals, and the armature terminal voltage is then varied.

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