MCQOPTIONS
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				| 1. | 
                                    Which of the following devices has the 'negative resistance' characteristic? | 
                            
| A. | Reflex klystron | 
| B. | Gunn diode | 
| C. | P-N-P transistor | 
| D. | Magnetron | 
| Answer» C. P-N-P transistor | |