Practice Exam

Element 4: Extra (EXPIRED)

E9C13

1. What is the main effect of placing a vertical antenna over an imperfect ground?

E4E06

2. What is a major cause of atmospheric static?

E5A17

3. What is the resonant frequency of a parallel RLC circuit if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?

Figure

E6B10

4. In Figure E6-3, what is the schematic symbol for a light-emitting diode?

E0A02

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

E9E01

6. What system matches a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places spaced a fraction of a wavelength each side of element center?

E2B15

7. What signals SSTV receiving equipment to begin a new picture line?

E5B10

8. What is the relationship between the current through an inductor and the voltage across an inductor?

E6A06

9. What is the beta of a bipolar junction transistor?

E9H04

10. What term describes station output, including the transmitter, antenna and everything in between, when considering transmitter power and system gains and losses?

E7F09

11. What is the purpose of a frequency counter?

E8D07

12. What is an electromagnetic wave?

E2D01

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

E4D04

14. Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?

E1F09

15. Which of the following conditions apply when transmitting spread spectrum emission?

E7B07

16. Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?

E4C03

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

E1E13

18. What are the consequences of failing to appear for re-administration of an examination when so directed by the FCC?

E4B11

19. How should a portable antenna analyzer be connected when measuring antenna resonance and feed point impedance?

E7E03

20. How does an analog phase modulator function?

Figure

E7D08

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

E6E01

22. What is a crystal lattice filter?

E5D13

23. How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere?

E3B10

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

E1B02

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

Figure

E6C07

26. In Figure E6-5, what is the schematic symbol for an AND gate?

E7A12

27. What is the name for logic which represents a logic "0" as a high voltage?

E3C08

28. What is the name of the high-angle wave in HF propagation that travels for some distance within the F2 region?

Figure

E9G06

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

E9D03

30. How does the beamwidth of an antenna vary as the gain is increased?

E7H17

31. Why is a phase-locked loop often used as part of a variable frequency synthesizer for receivers and transmitters?

E7C05

32. Which filter type is described as having ripple in the passband and a sharp cutoff?

E1D11

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

E8C09

34. Which of these techniques causes a digital signal to appear as wide-band noise to a conventional receiver?

E6F11

35. Which of the following is the approximate open-circuit voltage produced by a fully-illuminated silicon photovoltaic cell?

E9B05

36. What usually occurs if a Yagi antenna is designed solely for maximum forward gain?

E8A02

37. What type of wave has a rise time significantly faster than its fall time (or vice versa)?

E3A08

38. When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?

E8B12

39. What is digital time division multiplexing?

E7G13

40. What is meant by the term op-amp input-offset voltage?

E5C05

41. In polar coordinates, what is the impedance of a network consisting of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor?

E2C10

42. Why might a DX station state that they are listening on another frequency?

E9F06

43. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically one-half wavelength long at 14.10 MHz?

E1A03

44. With your transceiver displaying the carrier frequency of phone signals, you hear a DX station's CQ on 14.349 MHz USB. Is it legal to return the call using upper sideband on the same frequency?

E4A12

45. Which of the following procedures is an important precaution to follow when connecting a spectrum analyzer to a transmitter output?

E2A09

46. What do the terms L band and S band specify with regard to satellite communications?

E9A02

47. How much gain does a 1/2-wavelength dipole in free space have compared to an isotropic antenna?

E6D07

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

E1C04

49. When may an automatically controlled station retransmit third party communications?

E2E06

50. What is the most common data rate used for HF packet communications?