The value of flux involved m the e.m.f. equation of a transformer is
A. average value
B. r.m.s. value
C. maximum value
D. instantaneous value
Answer: Option C
Solution (By Examveda Team)
The value of flux involved in the e.m.f. equation of a transformer isGiven by:
E = 4.44 * f * N * Φmaxwhere:
E is the induced e.m.f.f is the frequency of the AC supplyN is the number of turns in the coilΦmax is the maximum fluxThe e.m.f. equation of a transformer involves the maximum value of the magnetic flux (Φmax) because the equation is derived based on the peak value of the sinusoidal flux waveform.
Therefore, the correct answer is Option C: maximum value.
This Question Belongs to Electrical Engineering >> Transformers
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Comments (4)
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
When transformers with different percentage impedances are connected in parallel, they will not share the load in proportion to their kVA ratings. The transformer with the lower impedance will take a larger share of the load, and the one with the higher impedance will take a smaller share, leading to inefficient operation and potential overloading of one transformer.
Explain plz
Please explain this question
It is maximum flux because the formula for emf equation is √2 πf*flux maximum*no of turns