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.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Transformers questions
In a step-down transformer, the output current _.
For step down transformer, Ns _ Np
A transformer steps down from 200V to 50V. If it has a secondary winding of 40 turns, then the number of windings in the primary coil are:
In transformer, there is no _ connection between the two coils but they are linked?
In an ideal transformer:
The phenomenon of mutual induction is practically used in: