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. |
Over the length of one transposition cycle of a power line, the total flux linkages of a nearby telephone line are zero for the balanced three phase currents. |
| A. | The above statement is valid |
| B. | The above statement is invalid |
| C. | It can t be concluded |
| D. | The above statement is valid for all conditions. |
| Answer» B. The above statement is invalid | |
| 2. |
Over the length of one transposition cycle of a power line, the total flux linkages of a nearby telephone line are zero for the unbalanced three phase currents. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
6.Transposition is the mean to balance ____________ |
| A. | Inductance |
| B. | Voltage |
| C. | Current |
| D. | All of the mentioned |
| Answer» B. Voltage | |
| 4. |
(I) Unsymmetrical spacing configurations cause the line interference. (II) Unsymmetrical spacing causes the voltage induction in the communication lines. |
| A. | (I) and (II) are valid |
| B. | Only (I) is valid |
| C. | Only (II) is valid |
| D. | Both are invalid |
| Answer» B. Only (I) is valid | |
| 5. |
A 10 MVA, 11 kV alternator has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that fault current for a single phase to ground fault will not exceed the rated line current in ohms is __________ |
| A. | 11.7 |
| B. | 12.8 |
| C. | 2.66 |
| D. | 5.2 |
| Answer» B. 12.8 | |
| 6. |
A 10 MVA, 11 kV alternator has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that fault current for a single phase to ground fault will not exceed the rated line current in pu is _____________ |
| A. | 0.97 |
| B. | 0.22 |
| C. | 0.87 |
| D. | 0.45 |
| Answer» B. 0.22 | |
| 7. |
A 10 MVA, 11 kV alternators has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that zero sequence of fault current for a single phase to ground fault will not exceed the rated line current in pu is ______ |
| A. | 0.22 |
| B. | 0.11 |
| C. | 0.16 |
| D. | 0.97 |
| Answer» B. 0.11 | |