A 100 MVA single phase transformer rated 80/120 kV is connected as an auto transformer in such a way that the doted terminal of LV side is connected to the un-doted terminal of HV side. Un-doted terminal of LV side is taken as common for both LV and HV. The rated voltage of 80 kV is applied to the low voltage winding of the transformer. Consider the transformer to be ideal and load to be such that the rated current flows through both primary and secondary windings. What is the kVA rating of the autotransformer?

A 100 MVA single phase transformer rated 80/120 kV is connected as an

1.	A 100 MVA single phase transformer rated 80/120 kV is connected as an auto transformer in such a way that the doted terminal of LV side is connected to the un-doted terminal of HV side. Un-doted terminal of LV side is taken as common for both LV and HV. The rated voltage of 80 kV is applied to the low voltage winding of the transformer. Consider the transformer to be ideal and load to be such that the rated current flows through both primary and secondary windings. What is the kVA rating of the autotransformer?
A.	200 MVA
B.	250 MVA
C.	172 MVA
D.	167 MVA
Answer» E.