Practice Exam

Element 4: Extra

E9E08

1. Which of the following measurements is characteristic of a mismatched transmission line?

E4E03

2. Which of the following signals might a receiver noise blanker be able to remove from desired signals?

E7E07

3. What is meant by the term baseband in radio communications?

E4A06

4. Which of the following could be determined with a spectrum analyzer?

Figure

E7B13

5. In Figure E7-2, what is the purpose of R?

E2C03

6. From which of the following bands is amateur radio contesting generally excluded?

E7A12

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

E4B08

8. Which of the following is a characteristic of a good DC voltmeter?

E1E05

9. What is the minimum passing score on amateur operator license examinations?

E9B11

10. What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength?

E9A07

11. What is a folded dipole antenna?

E6B05

12. What characteristic of a PIN diode makes it useful as an RF switch or attenuator?

E1B01

13. Which of the following constitutes a spurious emission?

E6C02

14. What logic state do the inputs of a TTL device assume if they are left open?

E9D08

15. What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?

E9H01

16. What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2-dB feed line loss, 2.2-dB duplexer loss and 7-dBd antenna gain?

E7F02

17. Which of the following would be used to reduce a signal's frequency by a factor of ten?

E1F10

18. What is the maximum transmitter power for an amateur station transmitting spread spectrum communications?

E9C13

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

E5D14

20. What is reactive power?

E0A01

21. What, if any, are the differences between the radiation produced by radioactive materials and the electromagnetic energy radiated by an antenna?

E9F09

22. 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?

E8C05

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

E2E05

24. How does ARQ accomplish error correction?

E8D13

25. Which of the following is a typical value for the peak voltage at a standard U.S. household electrical outlet?

E3A07

26. What frequency range would you normally tune to find EME signals in the 70 cm band?

Figure

E5C23

27. Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300-ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?

E8A07

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

Figure

E7G10

29. What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?

E7D02

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

E4D11

31. Why are third-order intermodulation products created within a receiver of particular interest compared to other products?

E1D07

32. Which amateur service HF bands have frequencies authorized to space stations?

E1A06

33. Which of the following describes the rules for operation on the 60 meter band?

E2A06

34. On what band would a satellite receive signals if it were operating in mode U/V?

E6F12

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

E5A01

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

E8B06

37. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?

E6D03

38. Which of the following is true of a charge-coupled device (CCD)?

E2D11

39. Which of the following data are used by the APRS network to communicate your location?

E7H05

40. How is positive feedback supplied in a Pierce oscillator?

E2B05

41. Which of the following is an advantage of using vestigial sideband for standard fast- scan TV transmissions?

E3B09

42. At what time of day is gray-line propagation most likely to occur?

E7C03

43. What advantage does a Pi-L-network have over a Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?

Figure

E6A11

44. In Figure E6-2, what is the schematic symbol for a P-channel junction FET?

E3C07

45. How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?

E6E06

46. What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?

Figure

E9G07

47. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

E1C10

48. What types of amateur stations may automatically retransmit the radio signals of other amateur stations?

E4C03

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

E5B05

50. How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?