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The voltage applied to a transformer primary is increased by keeping v/f ratio constant, with this the core loss will
- a)Decrease and magnetizing current Im will increase
- b)Increase and Im will also increase
- c)remain constant and Im will remain constant
- d)Increase and Im will remain constant
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The voltage applied to a transformer primary is increased by keeping v...
As v/f ratio is constant.
If v increases, f also increases.
As frequency increases, core losses also increases.
We know that, 
As v and f both increases, flux remain constant and hence magnetizing current will remain constant.
Most Upvoted Answer
The voltage applied to a transformer primary is increased by keeping v...
Explanation:
When the voltage applied to the transformer primary is increased by keeping v/f ratio constant, the core loss will increase and magnetizing current Im will remain constant. This is because:
1. Core Loss: The core loss in a transformer is mainly due to hysteresis and eddy current losses in the core material. Hysteresis loss is proportional to the frequency and the magnetic flux density, while eddy current loss is proportional to the square of the frequency and the square of the magnetic flux density. Keeping the v/f ratio constant means that the frequency and the magnetic flux density are also constant. Therefore, the core loss will increase proportionally with the applied voltage.
2. Magnetizing Current: The magnetizing current of a transformer is the current required to establish the magnetic field in the core. It is proportional to the applied voltage and inversely proportional to the frequency. Keeping the v/f ratio constant means that the frequency is also constant, so the magnetizing current will remain constant even if the applied voltage is increased.
Therefore, the correct answer is option D: Increase in voltage will increase the core loss but the magnetizing current will remain constant.
When the voltage applied to the transformer primary is increased by keeping v/f ratio constant, the core loss will increase and magnetizing current Im will remain constant. This is because:
1. Core Loss: The core loss in a transformer is mainly due to hysteresis and eddy current losses in the core material. Hysteresis loss is proportional to the frequency and the magnetic flux density, while eddy current loss is proportional to the square of the frequency and the square of the magnetic flux density. Keeping the v/f ratio constant means that the frequency and the magnetic flux density are also constant. Therefore, the core loss will increase proportionally with the applied voltage.
2. Magnetizing Current: The magnetizing current of a transformer is the current required to establish the magnetic field in the core. It is proportional to the applied voltage and inversely proportional to the frequency. Keeping the v/f ratio constant means that the frequency is also constant, so the magnetizing current will remain constant even if the applied voltage is increased.
Therefore, the correct answer is option D: Increase in voltage will increase the core loss but the magnetizing current will remain constant.
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The voltage applied to a transformer primary is increased by keeping v/f ratio constant, with this the core loss willa)Decrease and magnetizing current Imwill increaseb)Increase and Imwill also increasec)remain constant and Imwill remain constantd)Increase and Imwill remain constantCorrect answer is option 'D'. Can you explain this answer?
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