The transformers operate at ______ power factor when lightly loaded?
Right Answer is:
We know that the total reactance of a transformer is Nφ/I.
where I is the load current.
The larger the load current, the smaller will be the inductance or reactance (2πfL).
Hence, the overall reactance of a transformer decreases with the increase in load. That is why transformers operate at poor power factor when lightly loaded.