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				| 1. | A chopper circuit is operating on TRC control mode at a frequency of 2 kHz on a 230 V dc supply. For output voltage of 170 V, the conduction and blocking periods of a thyristor in each cycle are respectively | 
| A. | 0.386 ms and 0.114 ms | 
| B. | 0.369 ms and 0.131 ms | 
| C. | 0.390 ms and 0.110 ms | 
| D. | 0.131 ms and 0.369 ms | 
| Answer» C. 0.390 ms and 0.110 ms | |