Practice Exam

Element 4: Extra

E6A06

1. What is the beta of a bipolar junction transistor?

E6C06

2. Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

Figure

E9G07

3. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

E2E01

4. Which of the following types of modulation is common for data emissions below 30 MHz?

E8D01

5. Why are received spread spectrum signals resistant to interference?

E1D01

6. What is the definition of telemetry?

E9H10

7. How can the output voltage of a multiple-turn receiving loop antenna be increased?

E4C04

8. What is the noise figure of a receiver?

E8A08

9. Why would a direct or flash conversion analog-to-digital converter be useful for a software defined radio?

E9C02

10. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

E4A02

11. Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?

E4E09

12. What undesirable effect can occur when using an IF noise blanker?

E7F09

13. Why is an anti-aliasing digital filter required in a digital decimator?

Figure

E7D07

14. What is the purpose of C2 in the circuit shown in Figure E7-2?

E2B04

15. How is color information sent in analog SSTV?

E6E02

16. Which of the following device packages is a through-hole type?

E8B07

17. Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?

E9D06

18. What happens to the SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?

E6F11

19. What is the approximate open-circuit voltage produced by a fully illuminated silicon photovoltaic cell?

E3A12

20. What is the cause of auroral activity?

E7E10

21. How does a diode envelope detector function?

E7A10

22. What is a truth table?

E9A02

23. What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain?

E7B14

24. Why are switching amplifiers more efficient than linear amplifiers?

E2A07

25. Which of the following types of signals can be relayed through a linear transponder?

Figure

E6B10

26. In Figure E6-2, what is the schematic symbol for a light-emitting diode?

E2D02

27. Which of the following is a good technique for making meteor scatter contacts?

E7H04

28. How is positive feedback supplied in a Colpitts oscillator?

E8C07

29. What is the bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission?

E9F10

30. What impedance does a 1/8-wavelength transmission line present to a generator when the line is shorted at the far end?

E3C12

31. How does the maximum range of ground-wave propagation change when the signal frequency is increased?

E7C08

32. Which of the following factors has the greatest effect on the bandwidth and response shape of a crystal ladder filter?

E1A08

33. If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

E2C11

34. How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?

E1C13

35. What notifications must be given before transmitting on the 630 meter or 2200 meter bands?

E5B02

36. What letter is commonly used to represent susceptance?

E1F05

37. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

E3B09

38. At what time of year is sporadic E propagation most likely to occur?

E5A07

39. What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

E6D10

40. What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

E1B02

41. Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?

E9E07

42. What parameter describes the interactions at the load end of a mismatched transmission line?

E4B08

43. Which of the following can be used to measure the Q of a series-tuned circuit?

E4D08

44. What causes intermodulation in an electronic circuit?

E5D03

45. What is microstrip?

E1E08

46. To which of the following examinees may a VE not administer an examination?

E5C07

47. Where is the impedance of a pure resistance plotted on rectangular coordinates?

E0A08

48. What does SAR measure?

Figure

E7G09

49. What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

E9B11

50. What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?