Discussion
A Tap changer is used on a transformer for:
Answer: B
A tap changer is used for Adjustment in secondary voltage.
Taps change the number of turns in use, and so the turns ratio. The purpose is to keep the secondary (output) voltage at its desired value as the supply voltage or the load changes. Taps are usually placed on the high-voltage winding, where the current is smaller, but the quantity being regulated is the secondary voltage.
The primary voltage is fixed by the supply and cannot be adjusted by the transformer. Changing turns does not change the power factor, which is set by the load.
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