Single Phase Transformer MCQs (Top 10 Questions with Answers) – Electrical Basics 2026
Test your electrical engineering knowledge with 10 important multiple choice questions (MCQs) on single phase transformer. Ideal for diploma, ITI, and engineering students preparing for exams. Practice the most important single phase transformer MCQs with answers. These top 10 multiple choice questions cover principles, losses, efficiency, and applications. Perfect for electrical engineering exams, ITI, diploma, and competitive tests.
1. The main principle on which a single-phase transformer works is:
Electrostatic induction
Electromagnetic induction
Mutual resistance
Magnetic hysteresis
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Wrong Answer
2. In a single-phase transformer, the input power is supplied to:
Secondary winding
Core
Primary winding
Both windings
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3. Which part of a transformer provides a low reluctance path for magnetic flux?
Primary winding
Secondary winding
Core
Insulation
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4. The ratio of secondary voltage to primary voltage of a transformer is equal to:
Ratio of currents
Ratio of power
Turns ratio
Efficiency
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5. A transformer works efficiently on:
DC supply
AC supply
Both AC and DC
High-frequency DC
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6. If the number of turns in the secondary winding is more than the primary winding, the transformer is called:
Isolation transformer
Step-down transformer
Auto transformer
Step-up transformer
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7. The losses that occur in the transformer core are called:
Copper losses
Dielectric losses
Mechanical losses
Iron losses
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8. Which of the following losses depends on load current?
Hysteresis loss
Eddy current loss
Copper loss
Core loss
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9. The efficiency of an ideal transformer is:
Less than 90%
95%
99%
100%
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10. The purpose of transformer oil in a single-phase transformer is:
Increase voltage
Reduce losses
Cooling and insulation
Increase magnetic flux
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