MCQOPTIONS
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MCQOPTIONS
This section includes 16 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. |
Surge impedance for 400ohms implies for a transmission line that ___________ |
| A. | line can be theoretically loaded up to 400ohms |
| B. | line can be practically loaded up to 400ohms |
| C. | open circuit impedance of 400ohms |
| D. | short circuit impedance of 400ohms |
| Answer» B. line can be practically loaded up to 400ohms | |
| 2. |
Estimate the transmission line parameters (ABCD), for the given distributed network and find AB-CD. |
| A. | 1 |
| B. | Y |
| C. | Y-Z1Z2 |
| D. | 0 |
| Answer» B. Y | |
| 3. |
With 100% series compensation of the transmission lines, which of the following effects are not observed?(i) Low transient voltage(ii) High transient current(iii) The current is series resonant at power frequency |
| A. | (ii), (iii) |
| B. | (i) |
| C. | (i), (ii), (iii) |
| D. | (iii) |
| Answer» C. (i), (ii), (iii) | |
| 4. |
With 100% series compensation of the transmission lines, which of the following effects are observed?(i) Low transient voltage(ii) High transient current(iii) The current is series resonant at power frequency |
| A. | (ii), (iii) |
| B. | (i), (ii) |
| C. | (i), (ii), (iii) |
| D. | (iii) |
| Answer» B. (i), (ii) | |
| 5. |
For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1.Then the no load line voltage at the receiving end would be _________ |
| A. | 148.3 kV |
| B. | 140.8 kV |
| C. | 149.2 kV |
| D. | 132 kV |
| Answer» B. 140.8 kV | |
| 6. |
For the circuit representation of a transmission line below, the transmission line T-matrix will be . Then AB – CD value will be _________ |
| A. | Y |
| B. | 1 |
| C. | -Y |
| D. | 1-Y |
| Answer» B. 1 | |
| 7. |
Nominal-T and nominal-π are equivalent to each other. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
WITH_100%_SERIES_COMPENSATION_OF_THE_TRANSMISSION_LINES,_WHICH_OF_THE_FOLLOWING_EFFECTS_ARE_OBSERVED??$ |
| A. | Low transient voltage |
| B. | High transient current |
| C. | The current is series resonant at power frequency |
| D. | (ii), (iii) |
| Answer» B. High transient current | |
| 9. |
With_100%_series_compensation_of_the_transmission_lines,_which_of_the_following_effects_are_not_observed?$ |
| A. | Low transient voltage |
| B. | High transient current |
| C. | The current is series resonant at power frequency |
| D. | (ii), (iii) |
| Answer» C. The current is series resonant at power frequency | |
| 10. |
Surge impedance for 400ohms implies for a transmission line that ___________ |
| A. | line can be theoretically loaded up to 400ohms |
| B. | line can be practically loaded up to 400ohms |
| C. | open circuit impedance of 400ohms |
| D. | short circuit impedance of 400ohms |
| Answer» B. line can be practically loaded up to 400ohms | |
| 11. |
Which of the parameters of a long transmission line and medium transmission lines are same? |
| A. | A and D |
| B. | B, C |
| C. | Only A |
| D. | Only D |
| Answer» B. B, C | |
| 12. |
For the lines more than 250 km, the parameters of a line are considered not ______ but _____ |
| A. | lumped , distributed |
| B. | distributed, lumped |
| C. | lumped, non uniform lumped |
| D. | uniform, lumped |
| Answer» B. distributed, lumped | |
| 13. |
For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1 delivering 25 MVA at 0.8 power factor lagging in nature to the load at 132 kV. The voltage regulation is ___________$ |
| A. | 12.3 |
| B. | 12.8 |
| C. | 14.2 |
| D. | -2.3 |
| Answer» B. 12.8 | |
| 14. |
For a medium transmission line system if the sending end line voltage is 143 kV with the line impedance as 101.24∠74° Ω and shunt admittance of 7.38*10-4∠90° Ω-1.Then the no load line voltage at the receiving end would be _________$ |
| A. | 148.3 kV |
| B. | 140.8 kV |
| C. | 149.2 kV |
| D. | 132 kV |
| Answer» B. 140.8 kV | |
| 15. |
The transfer of the reactive power over a line mainly depends upon _____ |
| A. | Vr |
| B. | Vs |
| C. | |V<sub>s</sub>| – |V<sub>r</sub>| |
| D. | Power angle |
| Answer» D. Power angle | |
| 16. |
Nominal-T and nominal-π are equivalent to each other. |
| A. | True |
| B. | False |
| Answer» C. | |