Transformers Objectives Part 07
121 . In a transformer no load current lags the applied voltage by somewhat less than 90
122 . A transformer has maximum efficiency when core loss and copper loss 1
123 . Two transformers are connected in parallel and share loads in the ratio of their KVA ratings when their ohmic impedances inverse ratio of their ratings
124 . Power input to a transformer at no load and rated voltage consists of core loss
125 . A Scott connected transformer cannot be paralleled with a Y-delta transformer
126 . Open circuit test on a transformer is done to determine the core loss
127 . When 400Hz transformer is operated at 50Hz its KVA rating is reduce to 1/8
