A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increased
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A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increased
C. Core flux density is reduced.
A. Flux density remains unaffected: This is not correct. The flux density in the transformer core is directly related to the applied voltage and frequency. If the frequency is reduced while the voltage remains the same, the flux density in the transformer core will also be reduced.
B. Iron losses are reduced: This is not correct. Iron losses in the transformer are caused by the alternating magnetic field in the core. As the frequency is reduced, the alternating field becomes weaker and the iron losses will also be reduced. However, this is not the only factor and iron losses depend on the operating condition of the transformer.
C. Core flux density is reduced: This is correct. As the frequency is reduced, the alternating magnetic field in the transformer core becomes weaker, which in turn reduces the flux density. This can lead to a reduction in the magnetizing current and iron losses.
D. Core flux density is increased: This is not correct. As the frequency is reduced, the alternating magnetic field in the transformer core becomes weaker, which in turn reduces the flux density.