MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Design Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The phase angle error is significantly affected by the small change in secondary turns. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
How many factors are present in the behavior of transformer under short circuit conditions? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 3. |
What is the range of current density in the windings of the current transformer? |
| A. | 1-3 A per mm<sup>2</sup> |
| B. | 2-3 A per mm<sup>2</sup> |
| C. | 1-2 A per mm<sup>2</sup> |
| D. | 0.5-2 A per mm<sup>2</sup> |
| Answer» D. 0.5-2 A per mm<sup>2</sup> | |
| 4. |
What is the dimension of the round copper wire made use of in the windings of current transformer? |
| A. | 3 cm<sup>2</sup> |
| B. | 3 mm<sup>2</sup> |
| C. | 3 m<sup>2</sup> |
| D. | 3 cm |
| Answer» C. 3 m<sup>2</sup> | |
| 5. |
The phase angle error is significantly affected by the small change in secondary turns? |
| A. | true |
| B. | false |
| Answer» C. | |
| 6. |
What is the best number of secondary turns of the current transformer? |
| A. | 1 |
| B. | 2 |
| C. | 1 or 2 less than the number such that the turns ratio is equal to the nominal current ratio |
| D. | 1 or 2 more than the number such that the turns ratio is equal to the nominal current ratio |
| Answer» D. 1 or 2 more than the number such that the turns ratio is equal to the nominal current ratio | |
| 7. |
What happens if the number of secondary turns is reduced? |
| A. | the primary turns is reduced |
| B. | the output is reduced |
| C. | the efficiency is reduced |
| D. | the transformation ratio is reduced |
| Answer» E. | |
| 8. |
What is the formula of the actual ratio? |
| A. | actual ratio = turns ratio + load current * secondary current |
| B. | actual ratio = turns ratio * load current * secondary current |
| C. | actual ratio = turns ratio + load current / secondary current |
| D. | actual ratio = turns ratio / load current * secondary current |
| Answer» D. actual ratio = turns ratio / load current * secondary current | |
| 9. |
What is the use of the turns compensation in current transformer? |
| A. | to increases the ratio error |
| B. | to reduce the ratio error |
| C. | to increase the phase angle error |
| D. | to reduce the phase angle error |
| Answer» C. to increase the phase angle error | |