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| Q. |
The primary purpose of the helix in a traveling-wave tube is to |
| A. | prevent the electron beam from spreading in the long tube |
| B. | reduce the axial velocity of the rf field |
| C. | ensure broadband operationreduce the noise figure |
| D. | none ofthe above. |
| Answer» B. reduce the axial velocity of the rf field | |
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