A single-phase 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor.
If it is reconfiguredas a 500 V/75O V auto-transformer, its efficiency at its new rated load at unity power factor will be
A. 0.95752
B. 0.97851
C. 0.98276
D. 0.99241
Show Answer
Answer: C
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