Practice Exam

Element 4: Extra

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

E8C10

1. What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits?

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E2A13

2. What type of satellite appears to stay in one position in the sky?

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E3B12

3. What is the primary characteristic of chordal hop propagation?

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E3A15

4. What is an electromagnetic wave?

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Figure

E9G06

5. On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

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E4C02

6. Which of the following portions of a receiver can be effective in eliminating image signal interference?

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E7D12

7. What is the drop-out voltage of an analog voltage regulator?

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Figure

E6A10

8. In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?

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E7H10

9. What information is contained in the lookup table of a direct digital frequency synthesizer?

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E0A07

10. How may dangerous levels of carbon monoxide from an emergency generator be detected?

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E2D07

11. What digital protocol is used by APRS?

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E9E07

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

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E5D17

13. How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?

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E4E15

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

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E2C01

15. Which of the following is true about contest operating?

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E7A11

16. What type of logic defines "1" as a high voltage?

E1D10

17. Which amateur stations are eligible to be telecommand stations?

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E9C10

18. Which of the following describes a Zepp antenna?

E1A13

19. Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?

E1C06

20. Which of the following statements concerning remotely controlled amateur stations is true?

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E7E11

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

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E5A03

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

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E7F16

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

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Figure

E9B05

24. What type of antenna pattern over real ground is shown in Figure E9-2?

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E7B02

25. What is a Class D amplifier?

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E3C08

26. What does the space weather term G5 mean?

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E6D07

27. What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?

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E9D07

28. What is an advantage of using top loading in a shortened HF vertical antenna?

E1E10

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

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E6F11

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

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E4A10

31. Which of the following displays multiple digital signal states simultaneously?

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E4D03

32. How can intermodulation interference between two repeaters occur?

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E4B03

33. If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

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E9F05

34. 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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E8D11

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

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E6E05

36. Which of the following noise figure values is typical of a low-noise UHF preamplifier?

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E9H07

37. Why is it advisable to use an RF attenuator on a receiver being used for direction finding?

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E7C06

38. What are the distinguishing features of an elliptical filter?

E1B06

39. Which of the following additional rules apply if you are installing an amateur station antenna at a site at or near a public use airport?

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E8B09

40. What is meant by deviation ratio?

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E5C13

41. What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?

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E7G08

42. How does the gain of an ideal operational amplifier vary with frequency?

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E5B12

43. What is admittance?

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E9A08

44. What is meant by antenna bandwidth?

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E8A07

45. What determines the PEP-to-average power ratio of a single-sideband phone signal?

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E6C13

46. Which of the following is an advantage of BiCMOS logic?

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E2E13

47. Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

E1F07

48. When may an amateur station send a message to a business?

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E6B04

49. What type of semiconductor device is designed for use as a voltage-controlled capacitor?

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E2B03

50. How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?