MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
x/√3:1 ratio is obtained in ______________ |
| A. | Star/delta |
| B. | Delta/star |
| C. | Delta/delta |
| D. | Star/star |
| Answer» C. Delta/delta | |
| 2. |
What is the ratio of transformation of star/delta connection? |
| A. | Phase transformation x:1, line transformation x:1 |
| B. | Phase transformation x:1, line transformation √3x:1 |
| C. | Phase transformation x:1, line transformation 3x:1 |
| D. | Can’t determine with information available |
| Answer» B. Phase transformation x:1, line transformation √3x:1 | |
| 3. |
Star/delta connection is also called as ____________ |
| A. | 300-connection |
| B. | 00-connection |
| C. | -300-connection |
| D. | 300/-300-connection |
| Answer» E. | |
| 4. |
Open delta connection has VA rating of _______________ |
| A. | √3 times delta/delta VA rating |
| B. | 1/√3 times delta/delta VA rating |
| C. | 3 times delta/delta VA rating |
| D. | 1/3 times delta/delta VA rating |
| Answer» C. 3 times delta/delta VA rating | |
| 5. |
What is the ratio of transformation of delta/delta connection? |
| A. | Phase transformation x:1, line transformation x:1 |
| B. | Phase transformation x:1, line transformation 2x:1 |
| C. | Phase transformation x:1, line transformation x/3:1 |
| D. | Can’t determine |
| Answer» B. Phase transformation x:1, line transformation 2x:1 | |
| 6. |
In a three-phase star – delta transformer, what is the angle difference between primary and secondary phase voltages? |
| A. | Delta side leads by 300 |
| B. | Delta side lags by 300 |
| C. | Star side leads by 300 |
| D. | Star side lags by 300 |
| Answer» B. Delta side lags by 300 | |
| 7. |
OPEN_DELTA_CONNECTION_HAS_VA_RATING_OF________________?$ |
| A. | ‚àö3 times delta/delta VA rating |
| B. | 1/‚àö3 times delta/delta VA rating |
| C. | 3 times delta/delta VA rating |
| D. | 1/3 times delta/delta VA rating |
| Answer» C. 3 times delta/delta VA rating | |
| 8. |
What is the ratio of transformation of star/delta connection?$ |
| A. | Phase transformation x:1, line transformation x:1 |
| B. | Phase transformation x:1, line transformation ‚àö3x:1 |
| C. | Phase transformation x:1, line transformation 3x:1 |
| D. | Can’t determine with information available |
| Answer» B. Phase transformation x:1, line transformation ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ3x:1 | |
| 9. |
Star/delta_connection_is_also_called_as_____________$ |
| A. | 300-connection |
| B. | 00-connection |
| C. | -300-connection |
| D. | 300/-300-connection |
| Answer» E. | |
| 10. |
Which both connections have the same line transformation ratios? |
| A. | Star/star and delta/delta |
| B. | Star/delta and delta/star |
| C. | Star/zig-zag star and delta/zig-zag star |
| D. | Star/star, delta/delta and star/delta, delta/star |
| Answer» E. | |
| 11. |
x/‚àö3:1 ratio is obtained in ______________$ |
| A. | Star/delta |
| B. | Delta/star |
| C. | Delta/delta |
| D. | Star/star |
| Answer» C. Delta/delta | |
| 12. |
Delta/delta connection is also called as ____________ |
| A. | 00-connection |
| B. | 900-connection |
| C. | 1800-connection |
| D. | 00/1800-connection |
| Answer» E. | |
| 13. |
What is the ratio of transformation of star/star connection? |
| A. | Phase transformation x:1, line transformation x:1 |
| B. | Phase transformation x:1, line transformation 2x:1 |
| C. | Phase transformation x:1, line transformation x/3:1 |
| D. | Can’t say |
| Answer» B. Phase transformation x:1, line transformation 2x:1 | |
| 14. |
Which can be also called as 00 /1800 connection? |
| A. | Star/star |
| B. | Direct star |
| C. | Delta/star |
| D. | Star/delta |
| Answer» B. Direct star | |
| 15. |
In a three-phase star – delta transformer, what is the angle difference between primary and secondary phase voltages?$ |
| A. | Delta side leads by 300 |
| B. | Delta side lags by 300 |
| C. | Star side leads by 300 |
| D. | Star side lags by 300 |
| Answer» B. Delta side lags by 300 | |
| 16. |
Scott connections are used in _______________ |
| A. | three-phase to single phase transformation |
| B. | three-phase to two-phase transformation |
| C. | single phase to three-phase transformation |
| D. | all phase transformations |
| Answer» C. single phase to three-phase transformation | |
| 17. |
When does delta/star transformer work satisfactorily? |
| A. | Load is balanced only |
| B. | Load is unbalanced only |
| C. | On balanced as well as unbalanced loads |
| D. | Independent of load type |
| Answer» D. Independent of load type | |
| 18. |
When does star/star transformers work satisfactorily? |
| A. | Load is unbalanced only |
| B. | Load is balanced only |
| C. | On balanced as well as unbalanced loads |
| D. | Independent of load type |
| Answer» C. On balanced as well as unbalanced loads | |