MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Unbalancing of an alternator may occur due to ____________ |
| A. | single phase fault |
| B. | unbalanced loading |
| C. | line breaking |
| D. | all of the mentioned |
| Answer» E. | |
| 2. |
Bias is used in the relay protection to _______________ |
| A. | provide balanced sharing of current |
| B. | reduce current level |
| C. | deivert the current |
| D. | none of the mentioned |
| Answer» B. reduce current level | |
| 3. |
A longitudinal differential protection on stator can detect inter-turn on the stator. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
4.If the specified fault setting for a winding is mentioned as 20%, then what can be inferred about it? |
| A. | If a terminal fault has its current limited to the full load rating, then 20% of winding from neutral end will be unprotected |
| B. | If a terminal fault has its current limited to the full load rating, then 80% of winding from neutral end will carry current |
| C. | If a terminal fault has its voltage limited to the full load rating, then 20% of winding from neutral end will be unprotected |
| D. | Any of the mentioned |
| Answer» B. If a terminal fault has its current limited to the full load rating, then 80% of winding from neutral end will carry current | |
| 5. |
We need the biasing of differential relay biased to avoid mal operation when used for transformer protection due to ____________ |
| A. | mismatch of CT |
| B. | saturation of |
| C. | difference in connection of both sides of CT |
| D. | current setting mismatch |
| Answer» B. saturation of | |
| 6. |
The given figure shows protection system scheme for one phase of generator. A high resistance fault occurs near the neutral end with the current distribution as marked. The slope of the relay is 10% and pick-up current of 0.15A.The CT ratio is 500/5. |
| A. | nWill the relay operate under given circumstances? |
| B. | True |
| C. | False |
| Answer» C. False | |
| 7. |
A protection system engineer is planning to provide the complete protection, he can achieve this by ___________ |
| A. | three phase fault relays and two earth fault relays |
| B. | two phase fault relays and three earth fault relays |
| C. | a two phase fault relays and three earth fault relays |
| D. | a two phase fault relays and two earth fault relays |
| Answer» B. two phase fault relays and three earth fault relays | |