A Synchronous Motor Connected to Infinite Bus-Bars Has at Constant

question 16

Multiple Choice

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have

• A)no change of power factor
• B)lagging power factor with over-excitation
• C)leading power factor with under-excitation
• D)leading power factor with over-excitation

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