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				| 1. | A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current is | 
| A. | 100 Hz | 
| B. | 150 Hz | 
| C. | 250 Hz | 
| D. | 300 Hz | 
| Answer» D. 300 Hz | |