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#### MCQ on Single Phase Transformer - Electrical Engineering

Transformer MCQ Questions and Answers for the best preparation for the Transformer & Electrical Engineering Exams and interviews.

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Question 1: A transformer is working at its full load and its efficiency is also maximum. Its iron loss is 1 kW, its copper loss at half load will be?

• 0.5 kW
• 0.2 kW
• 0.25 kW
• 0.1 kW

Question 2: A transformer having a turn ratio 1: 5 and a resistance of 1000 ? is connected across the secondary terminals, the resistance offered to a current flowing in the primary will be?

• 40 ?
• 60 ?
• 20 ?
• 10 ?

Question 3: For minimum weight of a transformer, the weight of iron should be?

• less than weight of copper
• greater than weight of copper
• zero
• equal to the weight of copper
• Answers: equal to the weight of copper

Question 4: A no-load test is performed on a transformer to determine?

• magnetising current
• efficiency
• copper loss
• core loss

Question 5: Which winding of the transformer has less cross-sectional area?

• Low voltage winding
• Secondary winding
• High voltage winding
• Primary winding

Question 6: The secondary winding of a current transformer whose primary is carrying current should?

• none of the above
• either of the above
• not be short-circuited
• not be open-circuited

Question 7: The size of a transformer core will depend on?

• area of the core
• (a) and (d) both
• flux density of the core material
• frequency
• Answers: (a) and (d) both

Question 8: In a transformer the resistance between its primary and secondary should be ?

• zero
• 1000 ?
• infinity
• 10?

Question 9: In an ideal transformer, on no-load, the primary voltage is balanced by ?

• the secondary induced EMF
• the drop across resistances and reactance
• the secondary voltage
• the primary induced EMF
• Answers: the secondary induced EMF

Question 10: The short-circuit voltage of a transformer mainly depends on the?

• cross-sectional area of the iron core
• ohmic resistance of primary winding
• ohmic resistance of secondary winding
• magnitude of leakage flux
• Answers: magnitude of leakage flux

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