MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 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. |
The corona loss on a particular system at 50 Hz is 1 kW/phase per km. The corona loss on the same system in case of DC transmission will be ____________ |
| A. | Zero |
| B. | 0.5 kW/phase/km |
| C. | 0.33 kW/phase/km |
| D. | 0.6 kW/phase/km |
| Answer» D. 0.6 kW/phase/km | |
| 2. |
It is required to implement the HVDC system using the thyristors in large numbers. Why it becomes necessary to use a large number of thyristor switches? |
| A. | Due to low voltage rating of thyristor switches |
| B. | Due to low current rating of thyristor switches |
| C. | Due to lack of response for open circuit fault |
| D. | Cannot be determined |
| Answer» B. Due to low current rating of thyristor switches | |
| 3. |
What of the below mentioned statements are incorrect as compared to the HVDC system? |
| A. | Back to back connection is possible |
| B. | More corona losses |
| C. | Distance limitation |
| D. | Extra reactive power compensation |
| Answer» C. Distance limitation | |
| 4. |
As compared to the HVDC line, the corona and radio interference in a HVAC line are ____ |
| A. | more |
| B. | lesser |
| C. | same |
| D. | cannot be determined |
| Answer» B. lesser | |
| 5. |
The reactive power demand of the converters in HVDC can be provided by ___________ |
| A. | AC filters |
| B. | Shunt Capacitors |
| C. | SVC |
| D. | AC Filters, Shunt Capacitors and SVC |
| Answer» E. | |
| 6. |
(i) Low short circuit current is required in dc system (ii) Fast control of the converter switches cannot effectively control the damping of the oscillations. Choose the most appropriate. |
| A. | (i) and (ii) both are true |
| B. | Only (ii) is false |
| C. | Only (i) is false |
| D. | Both statements are false |
| Answer» C. Only (i) is false | |
| 7. |
DC line transmission can be used to provide _______ link. |
| A. | asynchronous |
| B. | synchronous |
| C. | lossless |
| D. | none of the mentioned |
| Answer» B. synchronous | |
| 8. |
Steady state problem is not very serious problem in dc transmission line system due to which of the following systems? |
| A. | No reactive compensation |
| B. | Only resistance drop |
| C. | Stable voltage regulation |
| D. | No reactive compensation, resistance drop, voltage regulation |
| Answer» B. Only resistance drop | |
| 9. |
The amount of dc compensation needed by a 400 kV dc line for transmitting the data over 300 km having resistance as 5 ohms? |
| A. | 400 var |
| B. | 564 var |
| C. | 600 VAR |
| D. | None of the mentioned |
| Answer» B. 564 var | |
| 10. |
Which of the system would require more insulation, a 400 kV ac line or 400 kV dc line? |
| A. | 400 kV ac |
| B. | 400 kV dc |
| C. | Both will need same level of insulation |
| D. | Data is insufficient to decide |
| Answer» B. 400 kV dc | |