Practice Exam

Element 4: Extra

E8A07

1. What determines the PEP-to-average power ratio of an unprocessed single-sideband phone signal?

E3B02

2. What is the approximate maximum range for signals using transequatorial propagation?

E7A06

3. What is a characteristic of a monostable multivibrator?

Figure

E6C10

4. In Figure E6-3, which is the schematic symbol for a NOR gate?

E7F01

5. What is meant by "direct sampling" in software defined radios?

E4C07

6. What does the MDS of a receiver represent?

E8B08

7. What describes orthogonal frequency-division multiplexing (OFDM)?

E9E02

8. What antenna matching system matches coaxial cable to an antenna by connecting the shield to the center of the antenna and the conductor a fraction of a wavelength to one side?

E1E05

9. What must the VE team do with the application form if the examinee does not pass the exam?

E5B03

10. How is impedance in polar form converted to an equivalent admittance?

E4B03

11. Which S parameter is equivalent to forward gain?

E9G08

12. How is a Smith chart normalized?

E4A02

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

E2C10

14. Why do DX stations often transmit and receive on different frequencies?

Figure

E9B06

15. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

E1F08

16. Which of the following types of amateur station communications are prohibited?

E1A04

17. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?

E7E10

18. How does a diode envelope detector function?

E9D08

19. What happens as the Q of an antenna increases?

E7B01

20. For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct?

E6F04

21. What is the photovoltaic effect?

E9C02

22. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4- wavelength apart and fed 90 degrees out of phase?

E1D05

23. What must be posted at the location of a station being operated by telecommand on or within 50 kilometers of the Earth's surface?

E5D06

24. What parasitic characteristic creates an inductor's self-resonance?

E9F12

25. What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is open at the far end?

E2A12

26. What is the purpose of digital store-and-forward functions on an amateur radio satellite?

E1C10

27. What is the maximum mean power level for a spurious emission below 30 MHz with respect to the fundamental emission?

E6A05

28. How does DC input impedance at the gate of a field-effect transistor (FET) compare with that of a bipolar transistor?

E5A03

29. What is the magnitude of the impedance of a series RLC circuit at resonance?

E7C11

30. Which of the following measures a filter's ability to reject signals in adjacent channels?

E8C12

31. What factors affect the bandwidth of a transmitted CW signal?

E7G12

32. What is an operational amplifier?

E6B01

33. What is the most useful characteristic of a Zener diode?

E7D03

34. What device is used as a stable voltage reference?

E4E03

35. Which of the following types of noise are removed by a noise blanker?

E6D02

36. What is the equivalent circuit of a quartz crystal?

E2E13

37. Which of these digital modes has the highest data throughput under clear communication conditions?

E8D11

38. What is one advantage of using ASCII code for data communications?

E9A09

39. What is antenna efficiency?

E4D12

40. What is the link margin in a system with a transmit power level of 10 W (+40 dBm), a system antenna gain of 10 dBi, a cable loss of 3 dB, a path loss of 136 dB, a receiver minimum discernable signal of -103 dBm, and a required signal-to-noise ratio of 6 dB?

E0A03

41. Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

E7H06

42. Which of these functions can be performed by a phase-locked loop?

E5C02

43. How are impedances described in polar coordinates?

E9H05

44. What challenge is presented by a small wire-loop antenna for direction finding?

E2D01

45. Which of the following digital modes is designed for meteor scatter communications?

E2B06

46. What is vestigial sideband modulation?

E1B11

47. What does PRB-1 require of state and local regulations affecting amateur radio antenna size and structures?

E3A02

48. What characterizes libration fading of an EME signal?

E6E12

49. Why are DIP through-hole package ICs not typically used at UHF and higher frequencies?

E3C01

50. What is the cause of short-term radio blackouts?