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Question
If excitation of a synchronous motor running with a constant load is decreased from its normal value, ignoring effects of armature reaction, it leads to
Options:
A .  increase in both armature current and power factor angle
B .  increase in back e.m.f. but decrease in armature current
C .  increase in both armature current and power factor which is lagging
D .  increase in torque angle but decrease in back e.m.f.
Answer: Option A

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