Calculate number of turns in primary winding, given single phase core type transformer, average flux

Q.  A 5kV / 250V, 50Hz single phase core type transformer with average flux in the core is 0.05wb. The number of turns in the primary winding is
- Published on 29 Oct 15

a. 273
b. 278
c. 280
d. 287

ANSWER: 287

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