Exercise :: Power Electronics - Section 1
| 6. | A semiconverter feeding an RLE load operates in |
|||||||
Answer: Option A Explanation: Semiconvertor operates only in first quadrant. |
| 7. | The phenomenon of overlap in converter operation due to |
|||||||
Answer: Option B Explanation: Source inductance delays turn off and hence causes overlap. |
| 8. | A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is |
|||||||
Answer: Option B Explanation:
|
.| 9. | For a 12 pulse operation, the two 6 pulse units are fed by |
|||||||
Answer: Option C Explanation: 30° phase difference is necessary. |
| 10. | In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is |
|||||||
Answer: Option B Explanation: Since conduction is from a to p + a, period of conduction is p in each half cycle. |