Explore topic-wise MCQs in Transformers.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.

1.

What will happen to hysteresis loss if voltage is doubled, load is doubled and frequency is halved?

A. Will be twice
B. Will be halved
C. Will remain same
D. Will be four times
Answer» D. Will be four times
Discussion
2.

Hysteresis loss and eddy current loss is directly proportional to __________

A. f and f<sup>2</sup>
B. f<sup>2</sup> and f
C. f and f
D. f<sup>2</sup> and f<sup>2</sup>
Answer» B. f<sup>2</sup> and f
Discussion
3.

Approximate phasor diagram of a transformer is based on _____________

A. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>1</sub>
B. V<sub>2</sub>=E<sub>2</sub>+I<sub>2</sub>R<sub>2</sub>+jI<sub>2</sub>X<sub>2</sub>
C. V<sub>1</sub>=V<sub>2</sub>+I<sub>R</sub>+jI<sub>X</sub>
D. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>2</sub>
Answer» D. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>2</sub>
Discussion
4.

Which of the following equation correctly represents the exact phasor diagram of transformer?

A. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>1</sub>
B. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>2</sub>X<sub>2</sub>
C. V<sub>2</sub>=E<sub>2</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>1</sub>
D. V<sub>1</sub>=E<sub>1</sub>-I<sub>1</sub>R<sub>1</sub>+jI<sub>1</sub>X<sub>1</sub>
Answer» B. V<sub>1</sub>=E<sub>1</sub>+I<sub>1</sub>R<sub>1</sub>+jI<sub>2</sub>X<sub>2</sub>
Discussion
5.

If a transformer is made to run on to a voltage which is more than the rated voltage _______________

A. its power factor will deteriorate
B. its power factor will increase
C. its power factor will remain unaffected
D. its power factor will be zero
Answer» B. its power factor will increase
Discussion
6.

The voltage transformation ratio of a transformer is defined as ratio of _____________

A. primary turns to secondary turns
B. secondary current to primary current
C. secondary induced emf to primary induced emf
D. secondary terminal voltage to primary applied voltage
Answer» D. secondary terminal voltage to primary applied voltage
Discussion
7.

The maximum load that a power transformer can carry is limited because of its ___________

A. temperature rise
B. dielectric strength of oil
C. voltage ratio
D. copper loss
Answer» D. copper loss
Discussion
8.

Which of the following is not considered in the standard voltage scale for power supply in India?

A. 11kV
B. 33kV
C. 66kV
D. 122kV
Answer» E.
Discussion