MCQOPTIONS
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				| 1. | 
                                    Which of the following is a microwave source with a 'cross-field' structure? | 
                            
| A. | Double cavity klystron | 
| B. | Reflex klystron | 
| C. | Magnetron | 
| D. | Travelling wave tube | 
| Answer» D. Travelling wave tube | |