Which of the following is a potential symptom of ferro-resonance?

Ferro-resonance is a phenomenon that can occur in electrical systems when there is an interaction between inductive and capacitive elements that leads to an abnormal condition in transformers and other equipment. This condition results in excessive voltage and can cause significant damage to transformers, circuit breakers, and other components in the electrical network.

The symptoms of ferro-resonance can be detrimental, often including overheating and potential physical destruction of transformers. This is due to the excessive voltage levels that arise during the occurrence of ferro-resonance, which can exceed the design limits of the equipment. Therefore, recognizing that damage to transformers and other electrical equipment is a direct consequence of ferro-resonance highlights the seriousness of this phenomenon and underscores the importance of monitoring systems to prevent it.

In contrast, options like improved power factor, increased efficiency in equipment, and lower energy consumption would not be associated with ferro-resonance. These outcomes typically indicate a functioning and healthy electrical system, while ferro-resonance denotes instability and failure, particularly in the context of transformer operation.