Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?
Correct answer: D. Low field current
- A. High field current
- B. Low short circuit ratio
- C. High core losses
- D. Low field current
Explanation
A synchronous motor may fail to pull into synchronism when its field excitation is too low to provide sufficient synchronizing torque. High field current is not the usual cause of this failure.
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