Below are the answers key for Multiple Choice Questions in Chapter 11: Microwave Tubes and Circuits from the book Electronic Communication Systems by George Kennedy. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. d. CFA
2. b. BWO
3. a. noise figure increases
4. c. multiple or coaxial leads are used
5. a. is not a good low-level amplifier because of noise
6. a. prevent the oscillations that occur in two-cavity klystrons
7. b. has a greater bandwidth
8. b. returning electrons give energy to the gap oscillations
9. a. prevent mode jumping
10. d. ensure that the electrons will orbit around the cathode
11. d. rising sun
12. b. reduce the axial velocity of the RF field
13. b. prevent oscillations
14. c. avoid the bulk of an electromagnet
15. a. capable of a longer duty cycle
16. d. VTM
17. a. Periodic-permanent magnet
18. b. provide attenuation
19. d. traveling-wave tube
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