Practice Exam

Element 4: Extra

E9F09

1. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?

E7E05

2. What circuit is added to an FM transmitter to boost the higher audio frequencies?

Figure

E9G05

3. What type of chart is shown in Figure E9-3?

E7F10

4. What alternate method of determining frequency, other than by directly counting input pulses, is used by some counters?

E2D08

5. Which of the following types of packet frames is used to transmit APRS beacon data?

E6D01

6. What is cathode ray tube (CRT) persistence?

Figure

E6C10

7. In Figure E6-5, what is the schematic symbol for a NOR gate?

E2C05

8. What is the function of a DX QSL Manager?

E4C12

9. What is an undesirable effect of using too wide a filter bandwidth in the IF section of a receiver?

E7D02

10. What is one characteristic of a switching electronic voltage regulator?

E3B11

11. Which of the following describes gray-line propagation?

E9H05

12. What is the main drawback of a wire-loop antenna for direction finding?

E1A04

13. With your transceiver displaying the carrier frequency of phone signals, you hear a DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower sideband on the same frequency?

E9C11

14. How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus rocky ground?

Figure

E7B12

15. What type of circuit is shown in Figure E7-1?

E1F11

16. Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification?

E9A04

17. Why would one need to know the feed point impedance of an antenna?

E9E07

18. What term best describes the interactions at the load end of a mismatched transmission line?

E8B08

19. What parameter does the modulating signal vary in a pulse-position modulation system?

E1D08

20. Which VHF amateur service bands have frequencies available for space stations?

E6F12

21. What absorbs the energy from light falling on a photovoltaic cell?

E7G02

22. What is the effect of ringing in a filter?

E4A11

23. Which of these instruments could be used for detailed analysis of digital signals?

E9B06

24. If the boom of a Yagi antenna is lengthened and the elements are properly retuned, what usually occurs?

E8D01

25. Which of the following is the easiest voltage amplitude parameter to measure when viewing a pure sine wave signal on an analog oscilloscope?

E3C14

26. Why does the radio-path horizon distance exceed the geometric horizon?

E5A01

27. What can cause the voltage across reactances in series to be larger than the voltage applied to them?

E6B09

28. What is a common use for point contact diodes?

E7H04

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

E4B12

30. What is the significance of voltmeter sensitivity expressed in ohms per volt?

E8C03

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

E2B19

32. What special operating frequency restrictions are imposed on slow scan TV transmissions?

E6E02

33. Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter?

E3A01

34. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?

E2A03

35. What is the orbital period of an Earth satellite?

E8A04

36. What is equivalent to the root-mean-square value of an AC voltage?

E4D12

37. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

E0A02

38. When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

E1C08

39. What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?

E7A04

40. How many flip-flops are required to divide a signal frequency by 4?

E5C17

41. In rectangular coordinates, what is the impedance of a circuit that has an admittance of 5 millisiemens at -30 degrees?

Figure

E6A07

42. In Figure E6-1, what is the schematic symbol for a PNP transistor?

E1B10

43. What frequencies are authorized to an amateur station participating in RACES?

E7C08

44. What kind of digital signal processing audio filter might be used to remove unwanted noise from a received SSB signal?

E4E05

45. How can noise from an electric motor be suppressed?

E1E10

46. What must the administering VEs do after the administration of a successful examination for an amateur operator license?

E2E03

47. How is Forward Error Correction implemented?

E9D06

48. Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

E5B02

49. What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial voltage?

E5D16

50. What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current?