Power losses in a transformer can be minimized:
Correct answer: C. By minimizing Eddy currents
- A. By increasing the turn ratio
- B. By decreasing the turn ratio
- C. By minimizing Eddy currents
- D. By selecting core materials with a large hysteresis area
Explanation
Explanation:This option is correct because the flow of Eddy currents in the core of the transformer results in power loses due to heat. The use of laminated cores or core materials with high resistivity can help to reduce Eddy currents and minimize power loses. This option is not correct because increasing the turn ratio can lead to an increase in the voltage, which can result in higher power loses due to insulation breakdown. This option is also incorrect because decreasing the turn ratio can lead to a decrease in voltage, which can result in reduced efficiency. This option is also incorrect because using a material with a large hysteresis area can result in higher power loses due to the energy lost in magnetization and demagnetization cycles.
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About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
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