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For a single phase, two winding transformer, the supply frequency and voltage are both increased by 10%. The percentage changes in the hysteresis loss and eddy current loss, respectively, are
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- 10 and 21
- – 10 and 21
- 21 and 10
- – 21 and 10
Correct Option: A
| Hysteresis loss Ph α f B2m α f |  |  | x | α f1 - x Vx | |
| f |
Percentage change in Ph ,
| ∆Ph = |  | × 100 |  | % | |
| Ph1 |
| = | | × 100 | | % | |
| f1 - x Vx |
= [(1.1)1 - x (1.1)x – 1] × 100%
= [1.1 – 1] × 100 = 10%
Percentage change in Pe,
| ∆Pe = | | × 100 | | % | |
| Pe1 |
| = | | × 100 | | % | |
| V2 |
= [1(1.21 – 1) × 100 ] % = 21%
