For given applied voltage, with the increase in frequency of the applied voltage
A. eddy current loss will decrease
B. eddy current loss will increase
C. eddy current loss will remain unchanged
D. none of the above
Answer: Option C
This Question Belongs to Electrical Engineering >> Transformers
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The purpose of providing an iron core in a transformer is to
A. provide support to windings
B. reduce hysteresis loss
C. decrease the reluctance of the magnetic path
D. reduce eddy current losses
A good voltage regulation of a transformer means
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum
If the percentage impedances of the two transformers working in parallel are different, then
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
An ideal transformer will have maximum efficiency at a load such that
A. copper loss = iron loss
B. copper loss < iron loss
C. copper loss > iron loss
D. none of the above
Pe=Ke×Bm²×f²×t²×v in Watts
Eddy Current loss in transformer is denoted as,
Pe = Ke * f^2 * Bmax^2 * t^2 * v^2
Hence apparently, the eddy current loss Pe ∝ f^2, but for any given voltage, if f decreases, Bm increases correspondingly and if f increases Bm decreases correspondingly. Hence the eddy current loss Pe at any given voltage, is independent of frequency.
Eddy current loss Propotional to square or Freuency
So increase it
Correct answer is option B
Eddy current loss is proportional to the square of frequency it should be increase with the increase of frequency..
Ad current propotional to frequency
So why unchanging ad current looses
But we know that eddy current losses per cycle is proportional to frequency.... Then how frequency remains unchanged