MCQOPTIONS
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MCQOPTIONS
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 | |
| 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 | |
| 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> | |
| 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> | |
| 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 | |
| 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 | |
| 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 | |
| 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. | |