Below are the answers key for Multiple Choice Questions in Chapter 12: Semiconductor Microwave Devices 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. to improve the noise performance temperature
2. c. because it cannot operate at room temperature
3. b. is more likely to radiate
4. d. stripline
5. c. higher power-handling capability
6. a. easier integration with semiconductor devices
7. d. quartz crystal
8. a. transmission media like stripline
9. b. lend themselves more easily to integration
10. c. a step-recovery diode
11. b. higher efficiency
12. d. RIMPATT
13. a. Backward
14. d. PIN diode
15. a. Tunnel
16. b. gallium arsenide
17. d. beta of the transistor falls to unity unity
18. d. emitter area must be large
19. c. as an oscillator
20. c. a step-recovery diode must be used
21. b. degenerative amplifier
22. d. fp – fi
23. d. provide greater bandwidth
24. a. prevent noise feedback
25. b. yields a low noise figure
26. c. uses a high doping level to provide a narrow junction
27. a. increase the frequency stability
28. b. is available between the peak and valley points
29. c. larger voltage swing
30. a. electron transfer to a less mobile energy level
31. a. has a suitable empty energy band, which silicon does not have
32. b. high noise
33. d. provide frequency adjustments
34. a. a much greater bandwidth
35. c. must be cooled down to a few kelvins
36. c. radar
37. c. is an oscillator
38. d. single-frequency
39. b. using Q spoiling
40. b. prevent atmospheric interference
41. c. lower cost
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