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				| 1. | A single phase semiconverter has a freewheeling diode. If the firing angle is a and the load is purely resistive, the periods of conduction and freewheeling respectively are | 
| A. | p - a and 0 | 
| B. | p - a and a | 
| C. | p + a and 0 | 
| D. | p + a and a | 
| Answer» B. p - a and a | |