DGVCL Exam Paper (12-06-2016)
The main disadvantages of having poor power factors are:

All of these
Poor voltage regulation
High energy loss in conductor
High cost of station and distribution equipment

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DGVCL Exam Paper (12-06-2016)
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

No effect
Eddy Current and Hysteresis losses will be excessive
Current will be too much high
Transformer may start to smoke and burn

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