A two winding single phase transformer rated 60 k V A , 240 1200 V , 60 H z 60 k V A , 240 1200 V , 60 H z 60 k V A , 240 1200 V , 60 H z , has an efficiency of 0 96 when operated at rated load, 0 8 power factor lagging This transformer is to be utilized as a 1440 1200 V step down autotransformer in a power distribution system (a) Find the permissible k V A k V A k V A rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two winding transformer Assume an ideal transformer (b) Determine the efficiency of the autotransformer with the k V A k V A k V A loading of part (a) and 0 8 power factor leading

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Question: A two-winding single-phase transformer rated 60 k V A , 240 / 1200 V , 60 H z 60 k V A , 240 /

A two-winding single-phase transformer rated $60 k V A, 240 / 1200 V, 60 H z$ , has an efficiency of 0.96 when operated at rated load, 0.8 power factor lagging. This transformer is to be utilized as a 1440/1200-V step-down autotransformer in a power distribution system.

(a) Find the permissible $k V A$ rating of the autotransformer if the winding currents and voltages are not to exceed the ratings as a two-winding transformer. Assume an ideal transformer.

(b) Determine the efficiency of the autotransformer with the $k V A$ loading of part (a) and 0.8 power factor leading.

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