Practice Exam

Element 4: Extra

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

E2D04

1. What is the purpose of digital store-and-forward functions on an Amateur Radio satellite?

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

E9F05

2. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz?

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E7B02

3. What is a Class D amplifier?

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E2A05

4. What do the letters in a satellite's mode designator specify?

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

E9C07

5. What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?

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E9B07

6. How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from an isotropic antenna, assuming each is driven by the same amount of power?

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

E2C09

7. What type of equipment is commonly used to implement a ham radio mesh network?

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E7D10

8. What is the primary reason that a high-frequency switching type high voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

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E3C15

9. What might a sudden rise in radio background noise indicate?

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E6F10

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

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E8D05

11. What is the most common method of reducing key clicks?

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E7G02

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

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E5A08

13. What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

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E5D02

14. Why is it important to keep lead lengths short for components used in circuits for VHF and above?

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E6B13

15. What type of bias is required for an LED to emit light?

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E4E12

16. What is one disadvantage of using some types of automatic DSP notch-filters when attempting to copy CW signals?

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E9G04

17. What are the two families of circles and arcs that make up a Smith chart?

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E6C02

18. What happens when the level of a comparator's input signal crosses the threshold?

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E6E07

19. Which of the following is typically used to construct a MMIC-based microwave amplifier?

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E7H01

20. What are three oscillator circuits used in Amateur Radio equipment?

E1B01

21. Which of the following constitutes a spurious emission?

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E9E09

22. Which of these matching systems is an effective method of connecting a 50 ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?

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

E7C11

23. Which of the following is the common name for a filter network which is equivalent to two L-networks connected back-to-back with the two inductors in series and the capacitors in shunt at the input and output?

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E7E06

24. Why is de-emphasis commonly used in FM communications receivers?

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E5B06

25. What is susceptance?

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E4D12

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

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E8B10

27. What describes frequency division multiplexing?

E1E02

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

E1C02

29. What is meant by automatic control of a station?

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E7F16

30. How might the sampling rate of an existing digital signal be adjusted by a factor of 3/4?

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E8A12

31. What is an advantage of using digital signals instead of analog signals to convey the same information?

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E6A12

32. Why do many MOSFET devices have internally connected Zener diodes on the gates?

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E5C03

33. Which of the following represents an inductive reactance in polar coordinates?

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E6D02

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

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E8C04

35. What technique is used to minimize the bandwidth requirements of a PSK31 signal?

E1D11

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

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E3B10

37. What is the cause of gray-line propagation?

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E4A06

38. What is the effect of aliasing in a digital or computer-based oscilloscope?

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E9H11

39. What characteristic of a cardioid pattern antenna is useful for direction finding?

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E2E03

40. How is the timing of JT65 contacts organized?

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E3A09

41. Which of the following frequency range is most suited for meteor scatter communications?

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E9A17

42. What is the effective radiated power of a repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain?

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

E2B18

43. On which of the following frequencies is one likely to find FM ATV transmissions?

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E7A12

44. What type of logic defines "0" as a high voltage?

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

E4C03

45. What is the term for the blocking of one FM phone signal by another, stronger FM phone signal?

E1F03

46. Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

E1A05

47. What is the maximum power output permitted on the 60 meter band?

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

E4B09

48. What is indicated if the current reading on an RF ammeter placed in series with the antenna feed line of a transmitter increases as the transmitter is tuned to resonance?

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

E9D04

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

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

E0A03

50. Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?