railway DFCCIL Executive 2025 Mock Test Electrical Machines Transformer Auto Transformer

A single phase 50KVA 250V/500V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is reconfigured as a 500V/750V autotransformer its efficiency at the new rated load at unity power factor will be

1

95.752%

2

97.851%

3

98.276%

4

99.241%

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