Transformer MCQ for Interview - Electrical Engineering
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Test your knowledge with important Transformers MCQ and their applications. Transformers Multiple Choice Questions & Answers focuses on “Generator and Power Station Transformers”.
- none of above will happen
- hot because primary will carry heavy current
- hot because of heavy iron core losses taking place in it due to high flux density
- cool as there is no secondary current
Question 1: When secondary of a current transformer is open-circuited its iron core will be?
Answers: hot because of heavy iron core losses taking place in it due to high flux density
- less will be the secondary induced EMF.
- none of the above
- less will be the primary induced EMF.
- less will be the primary terminal voltage
Question 2: Greater the secondary leakage flux?
Answers: less will be the secondary induced EMF.
- R.M.S. value
- Average value
- Critical value
- Maximum value
Question 3: Which value of flux is involved in the EMF equation of the transformer?
Answers: Maximum value
- efficiency of the transformer
- magnetizing current and loss
- copper loss
- magnetising current
Question 4: No-load on a transformer is carried out to determine?
Answers: magnetizing current and loss
- mechanical vibrations
- oil in the transformer
- oil in the transformer
- load changes
Question 5: The hum in a transformer is mainly attributed to?
Answers: oil in the transformer
- none of the above
- core built up of laminations of cold rolled grain oriented steel
- either of the above
- core built-up of laminations of hot rolled sheet
Question 6: Reduction in core losses and increase in permeability are obtained with transformer employing?
Answers: core built-up of laminations of hot rolled sheet
- none of the above
- eddy current loss will remain unchanged
- eddy current loss will increase
- eddy current loss will decrease
Question 7: For given applied voltage, with the increase in frequency of the applied voltage?
Answers: eddy current loss will remain unchanged
- The transformer has high copper losses during the operation
- A high short-circuit current flows through the transformer
- A low short-circuit current flows through the transformer
- The transformer has high iron losses during the operation
Question 8: Which of the following statements about a transformer having a small short-circuit voltage is true?
Answers: A low short-circuit current flows through the transformer
- magnetostriction
- oil of the transformer
- laminations of the transformer
- walls of the tank
Question 9: The humming sound in a transformer is mainly due to?
Answers: magnetostriction
- take insulting oil from the conservator
- Provide insulation to the winding
- provide cooling to the winding
- extract moisture from the air
Question 10: The purpose of a breather in a transformer is to?
Answers: extract moisture from the air
Report Card
Total Questions Attempted: 0
Correct: 0 Wrong: 0
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