Below are the answers key for Multiple Choice Questions in Chapter 10: Waveguides, Resonators and Components 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. b. they are reflected from the walls but do not travel along them
2. d. they would be too bulky at lower frequencies
3. a. is greater than of free space
4. c. transmission lines use the principal mode of propagation, and therefore do not suffer from low-frequency cut-off
5. c. are less bulky
6. b. transverse-magnetic
7. d. greater than in the actual direction of propagation
8. d. phase velocity
9. c. the characteristic impedance of the guide becomes infinite
10. d. TE2,0
11. b. the resulting impedance can be matched directly to coaxial lines
12. c. to compensate for discontinuities at the join
13. b. E-plane T
14. c. Iris
15. b. waveguide below cutoff
16. c. harmonically related resonant frequencies
17. d. to increase the bandwidth of the system
18. a. a nonconductive with magnetic properties
19. c. garnet
20. a. Curie temperature
21. d. suitable for use as a microwave switch
22. b. to allow the one antenna to be used for reception or retransmission without mutual interference
23. b. lower attenuation
24. c. Coaxial
25. b. ridged
26. c. rectangular waveguide
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