MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A V-V connected transformer can be connected in parallel to delta-delta connected transformerbut not to _________ |
| A. | delta-star |
| B. | star-delta |
| C. | star-V |
| D. | star-delta and star-V both |
| Answer» B. star-delta | |
| 2. |
Three units of single phase transformers and one single three-phase transformer_____________ |
| A. | will be same for one rating |
| B. | can never be made same |
| C. | may be same |
| D. | depends on other factors |
| Answer» B. can never be made same | |
| 3. |
If one of the transformers is removed from the bank of only delta-delta, then it will behave as power delivery transformer of ________ |
| A. | 58% |
| B. | 78% |
| C. | 45% |
| D. | 100% |
| Answer» B. 78% | |
| 4. |
Auxiliary transformer connected to delta/delta transformer is of the type _______________ |
| A. | single phase transformer |
| B. | three-phase transformer |
| C. | two-phase transformers |
| D. | can be of any type |
| Answer» B. three-phase transformer | |
| 5. |
IF_ONE_OF_THE_TRANSFORMERS_IS_REMOVED_FROM_THE_BANK_OF_ONLY_DELTA-DELTA,_THEN_IT_WILL_BEHAVE_AS_POWER_DELIVERY_TRANSFORMER_OF_________?$ |
| A. | 58% |
| B. | 78% |
| C. | 45% |
| D. | 100% |
| Answer» B. 78% | |
| 6. |
A V-V connected transformer can be connected in parallel to delta-delta connected transformer$ |
| A. | |
| B. | delta-star |
| C. | star-delta |
| Answer» B. delta-star | |
| 7. |
Three_units_of_single_phase_transformers_and_one_single_three-phase_transformer_____________$ |
| A. | will be same for one rating |
| B. | can never be made same |
| C. | may be same |
| D. | depends on other factors |
| Answer» B. can never be made same | |
| 8. |
Auxiliary transformer connected to delta/delta transformer is of the type ______________? |
| A. | single phase transformer |
| B. | three-phase transformer |
| C. | two-phase transformers |
| D. | can be of any type |
| Answer» B. three-phase transformer | |
| 9. |
Where the auxiliary transformers are connected in back to back test of 3-phase transformer? |
| A. | Primaries |
| B. | Secondaries |
| C. | In the middle |
| D. | Can be connected to primaries or secondaries as well |
| Answer» E. | |
| 10. |
Auxiliary transformer is not needed in the back to back test. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
In back to back test two secondaries are connected ___________ |
| A. | in proper phase sequence |
| B. | in phase opposition |
| C. | in proper phase sequence and with phase opposition |
| D. | in opposite phase sequence |
| Answer» D. in opposite phase sequence | |
| 12. |
For performing back to back test on 3-phase transformer, transformers should be ___________ |
| A. | non-identical |
| B. | identical |
| C. | they can be identical or non-identical |
| D. | they should not be identical nor non-identical |
| Answer» C. they can be identical or non-identical | |
| 13. |
To reduce effect of 5th harmonic current ____________ |
| A. | separate path must be provided |
| B. | no need of separate path |
| C. | add a resistor in series |
| D. | add a resistor in parallel |
| Answer» B. no need of separate path | |
| 14. |
Suppressing of harmonic fluxes becomes more prominent in _______ |
| A. | fifth harmonic currents |
| B. | third harmonic currents |
| C. | fourth harmonic currents |
| D. | second harmonic currents |
| Answer» B. third harmonic currents | |
| 15. |
In three-phase transformer, the harmonic fluxes are suppressed because of ____________ |
| A. | high reluctance path |
| B. | low reluctance path |
| C. | any reluctance paths |
| D. | independent on reluctance path |
| Answer» B. low reluctance path | |