Practice Exam

Element 4: Extra

Study material for this question can be found in the following resources:

E9D02

1. How can linearly polarized Yagi antennas be used to produce circular polarization?

Study material for this question can be found in the following resources:

E8A05

2. What would be the most accurate way of measuring the RMS voltage of a complex waveform?

Study material for this question can be found in the following resources:

E6E12

3. Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?

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E6A15

4. Which semiconductor material contains excess holes in the outer shell of electrons?

E1E02

5. Where are the questions for all written U.S. amateur license examinations listed?

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E6F10

6. What is the most common type of photovoltaic cell used for electrical power generation?

E1F01

7. On what frequencies are spread spectrum transmissions permitted?

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E7A09

8. What logical operation is performed by an exclusive NOR gate?

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E9C09

9. What is a G5RV antenna?

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Figure

E7G09

10. What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

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E5B06

11. What is susceptance?

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E2D01

12. Which of the following digital modes is especially designed for use for meteor scatter signals?

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E8D08

13. What parameter might indicate that excessively high input levels are causing distortion in an AFSK signal?

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E9E04

14. What is the purpose of the series capacitor in a gamma-type antenna matching network?

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E5A01

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

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Figure

E9B06

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

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E6B02

17. What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?

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E7B09

18. Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a Pi-network output circuit?

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E2C04

19. What type of transmission is most often used for a ham radio mesh network?

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E8C05

20. What is the necessary bandwidth of a 13-WPM international Morse code transmission?

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E3A01

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

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E4A05

22. What might be an advantage of a digital vs an analog oscilloscope?

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E6D01

23. How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?

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E7H13

24. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?

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E7F02

25. What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?

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E4D09

26. What is the purpose of the preselector in a communications receiver?

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E7E11

27. Which type of detector is used for demodulating SSB signals?

E1A10

28. If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?

E1D11

29. Which amateur stations are eligible to operate as Earth stations?

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E2B16

30. Which is a video standard used by North American Fast Scan ATV stations?

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Figure

E5C16

31. Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?

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E5D14

32. What is reactive power?

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E9G02

33. What type of coordinate system is used in a Smith chart?

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E3C01

34. What does the term ray tracing describe in regard to radio communications?

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E4C01

35. What is an effect of excessive phase noise in the local oscillator section of a receiver?

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E7C13

36. What is one advantage of a Pi-matching network over an L-matching network consisting of a single inductor and a single capacitor?

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E4E15

37. Which of the following can cause shielded cables to radiate or receive interference?

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E9F03

38. Why is the physical length of a coaxial cable transmission line shorter than its electrical length?

E1C05

39. When may an automatically controlled station originate third party communications?

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E9H09

40. Which of the following describes the construction of a receiving loop antenna?

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E0A01

41. What is the primary function of an external earth connection or ground rod?

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Figure

E7D08

42. What type of circuit is shown in Figure E7-3?

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E9A05

43. What is included in the total resistance of an antenna system?

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E2E12

44. Which type of control is used by stations using the Automatic Link Enable (ALE) protocol?

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E2A08

45. Why should effective radiated power to a satellite which uses a linear transponder be limited?

E1B02

46. Which of the following factors might cause the physical location of an amateur station apparatus or antenna structure to be restricted?

Study material for this question can be found in the following resources:

E6C12

47. What is BiCMOS logic?

Study material for this question can be found in the following resources:

E4B12

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

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E3B09

49. At what time of year is Sporadic E propagation most likely to occur?

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E8B10

50. What describes frequency division multiplexing?