Transformers Questions and Answers
Transformers are a core concept in electrical and electronics engineering, used for voltage conversion, isolation, and power distribution. This topic features aptitude questions and answers related to transformer principles, EMF equations, efficiency, and losses. Ideal for GATE, NTPC, BHEL, and PSU aspirants, these questions help build a solid understanding of transformer performance under various conditions. Each problem comes with a detailed explanation for conceptual clarity. Practicing transformer aptitude questions with solutions PDF strengthens both theoretical and numerical skills, helping you excel in exams and technical interviews.
Transformers
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18 questions
11. The reflected load value that the source sees will always be larger than the load value itself.
- TRUE
- FALSE
12. An open secondary winding of a transformer will cause the primary current to be nearly zero.
- TRUE
- FALSE
13. The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.
- TRUE
- FALSE
14. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.
- TRUE
- FALSE
15. Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.
- TRUE
- FALSE
16. For mutual inductance to occur, the two coils must be at right angles to each other.
- TRUE
- FALSE
17. If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.
- TRUE
- FALSE
18. If an analog signal is to be converted to an 8-bit resolution, how many comparators are used in a parallel-encoded ADC?
- 127
- 128
- 255
- 256