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				| 1. | 
                                    A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is | 
                            
| A. | 8 W | 
| B. | 7.5 W | 
| C. | 7.1 W | 
| D. | 6.8 W | 
| Answer» D. 6.8 W | |