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Transformers

Free 134+ Transformers MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Transformers — MCQs for Pakistan government job tests

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Transformers

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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.What is the common term for the sound generated by a transformer?

8.Which component of a transformer can be seen externally?

9.Among the following insulating materials, which one can endure the highest temperature without damage?

10.How can the efficiency of two identical transformers be evaluated when operating under load?

11.Which device is used to safeguard electrical systems from voltage spikes caused by lightning and switching operations?

12.What does good voltage regulation in a transformer signify?

13.Which type of protection is typically absent in small distribution transformers?

14.At a steady load current, at which power factor does a transformer achieve its highest efficiency?

15.What does a transformer primarily change in an electrical circuit?

16.Under which condition does a transformer exhibit voltage regulation closest to zero?

17.What should the resistance value be between the primary and secondary windings of a transformer?

18.Why is the secondary winding of a current transformer kept short-circuited during normal operation?

19.What characteristic is associated with a shell-type transformer?

20.Natural air cooling for transformers is typically limited to transformers with a rating of up to what capacity?

How to prepare with Transformers MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Transformers appears in real exam conditions.

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