What is winding ratio between primary winding and secondary winding?

2:1- this is a ratio If primary is 100 Seconardary would be 50 Divide both sides by the largest common number- 50 100:50 = 2:1 Refering to a winding it tells us its the number of turns of wire around a air or iron core on each side

Answer

The winding ratio or, more correctly, 'turns ratio', of a transformer is the ratio of the number of turns in the primary and secondary winding. For an ideal transformers (most transformers are close to being 'ideal'), the turns ratio is the same as the voltage ratio. So if the secondary voltage is, say, ten times the primary voltage, then the transformer's voltage ratio is 1:10, and so, too, is its turns ratio.