A 2200/230 V, 20KVA two winding single phase transformer has core loss of 125W and full load copper loss of 300W. It is connected as a step up auto transformer with low voltage winding additively in series with the high voltage winding. Calculate,

i) Voltage ratings of primary and secondary.

ii) Voltage ratio.

iii) KVA rating.

iv) Efficiency at full load 0.8 pf.