Discussion
Loss of field excitation in a running synchronous motor causes
Answer: D
Correct answer: loss of synchronism and heavy pulsating current
With the field lost, the excitation emf collapses and so does the pull-out power \( EV/X_s \). Unless the load is very light the machine cannot hold synchronism; it slips poles, drawing a heavy pulsating current from the supply and producing pulsating torque in the shaft. A wound field machine may run on briefly as a reluctance motor at reduced capability, but the condition is a fault and field failure protection is fitted to trip it.
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