In a 25 𝑘VA, 3300/230 𝑉, 1-phase transformer, the iron and full-load copper losses are respectively 350 𝑊 and 400 𝑊 . The efficiency at half load 0.8 power factor will be nearly:
A. 83 %
B. 88 %
C. 94 %
D. 99 %
Answer:D
In a 25 𝑘VA, 3300/230 𝑉, 1-phase transformer, the iron and full-load copper losses are respectively 350 𝑊 and 400 𝑊 . The efficiency at half load 0.8 power factor will be nearly:
A. 83 % B. 88 % C. 94 % D. 99 %