The effect of increasing the load on a synchronous motor running with normal excitation is to___________?
Correct answer: C. increase armature current but decrease power factor
- A. decrease both armature current and power factor
- B. decrease armature current but increase power factor
- C. increase armature current but decrease power factor
- D. increase both its armature current and power factor
Explanation
Increasing mechanical load requires a larger torque angle, which increases the real component and total magnitude of armature current. With normal excitation, the motor consequently moves toward a more lagging power factor, so the power factor decreases.
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