MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Off-circuit tap changer is used when transformer is ________________ |
| A. | deenergized |
| B. | energized |
| C. | can be used in either energy conditions |
| D. | never used |
| Answer» B. energized | |
| 2. |
Tap changing do not causes change in losses of a transformer. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Tapping of HV winding is advantageous for _____________ |
| A. | step-up transformer |
| B. | step-down transformer |
| C. | both type of transformers |
| D. | never advantageous |
| Answer» C. both type of transformers | |
| 4. |
In case of large voltage variations transformers are tapped at _____________ |
| A. | LV |
| B. | HV |
| C. | Both LV and HV |
| D. | Can’t be tapped |
| Answer» C. Both LV and HV | |
| 5. |
For achieving large voltage regulation tapping should be done at _____________ |
| A. | at the upper ends |
| B. | at the lower ends |
| C. | at the centre |
| D. | anywhere |
| Answer» D. anywhere | |
| 6. |
Bushing insulators are required when ____________ |
| A. | tapping is done near the neutral end |
| B. | tapping is done at the line ends |
| C. | tapping is done |
| D. | they are not required |
| Answer» C. tapping is done | |
| 7. |
Tapping is done at _________________ |
| A. | primary only |
| B. | secondary only |
| C. | primary or secondary side |
| D. | on both sides |
| Answer» D. on both sides | |
| 8. |
Negative tapping means ________________ |
| A. | less turns than positive tap |
| B. | less turns than principal tap |
| C. | less turns than zero tap |
| D. | more turns than principal tap |
| Answer» C. less turns than zero tap | |
| 9. |
How tap changing is achieved? |
| A. | Voltage variation with constant flux and constant voltage turn |
| B. | With varying flux |
| C. | Either by voltage variation or by flux variation |
| D. | Can’t be done by variation in voltage or flux |
| Answer» D. Can’t be done by variation in voltage or flux | |
| 10. |
Common range pf tap changing is __________ |
| A. | 5% |
| B. | 7% |
| C. | 15% |
| D. | 10% |
| Answer» B. 7% | |
| 11. |
Why tapping is necessary? |
| A. | To provide a neutral point |
| B. | To vary secondary voltage |
| C. | To control real and reactive power flow in the network |
| D. | For neutral point, variation in secondary voltage, controlling power flow |
| Answer» E. | |