Below are the answers key for Frenzel Self-test in Chapter 8: Multiplexing from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. c. (Multiplexing uses a single channel to transmit multiple signals.)
2. telephone, telemetry
3. economy
4. demultiplexer
5. time division, frequency division
6. bandwidth
7. subcarriers
8. linear mixer
9. modulate
10. frequency
11. amplifying, filtering
12. subcarrier oscillator or VCO
13. bandpass filter
14. PLL
15. SSB
16.L + R
17.L + R. L - R. 19-kHz pilot, SCA
18. DSB
19. frequency
20. time slots or intervals.
21. pulse-amplitude modulation
22. 14
23. FET or MOSFET
24. clock recovery circuit
25. sync pulse
26. frame
27. low-pass filter
28. switch
29. gate
30. FM
31. phase-locked loop
32. binary codes
33. AID converter
34. 8
35. 8
36. T-1
37. companding
38. codec
39. noise
40. 24, 1.544
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