Discussion
The power factor of an ideal transformer should be:
Answer: A
The key gives zero as the power factor of an ideal transformer. An ideal transformer has no losses, and on no load it draws only the magnetising current, which lags the voltage by 90°, so its power factor on no load is cos 90° = 0 and no power is drawn.
Unity and the values 0.5 and 0.9 would imply real power drawn, and an ideal transformer takes none on no load. When loaded, the power factor is set by the load. The question is brief about this, so the answer follows the key. The first option is the one given.
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