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- Subject
- Transformerselectrical-engineering-mcqs › transformers
- Published
- 28 Jun 2018
- Last updated
- 28 May 2026
Explanation
The characteristic sound emitted by a transformer is known as a 'hum,' which results from the magnetostriction effect in the core and the vibration of laminations when alternating current passes through it.
More Transformers MCQs
Practice related questions from the same subject.
- 1.Identify the incorrect statement about an ideal single-phase transformer with a turns ratio of 1:2, which draws 10 A from a 200 V AC source.
- 2.In a transformer operating at a fixed voltage, which losses stay constant regardless of variations in load?
- 3.Which type of losses are present in rotating electrical machines but are absent in transformers?
- 4.How does the eddy current loss change when the frequency of a fixed applied voltage is increased?
- 5.Why are approximately 10% of the end turns in a power or distribution transformer heavily insulated?
- 6.Which type of transformer core construction results in reduced core losses and enhanced permeability?
- 7.Which component of a transformer can be seen externally?
- 8.Among the following insulating materials, which one can endure the highest temperature without damage?
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