A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased
Correct answer: D. power factor will decrease and armature current will increase
- A. power factor as well as armature current will decrease
- B. power factor as well as armature current will increase
- C. power factor will increase but armature current will decrease
- D. power factor will decrease and armature current will increase
Explanation
With normal excitation initially giving approximately unity power factor, increasing the load increases the active armature-current component. The fixed excitation then becomes relatively under-excited, so power factor decreases while armature current increases.
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