Practice Exam

Element 4: Extra

E6D16

1. What is one reason for using ferrite toroids rather than powdered-iron toroids in an inductor?

E1B05

2. What is the maximum bandwidth for a data emission on 60 meters?

E6F08

3. Why are optoisolators often used in conjunction with solid state circuits when switching 120 VAC?

E3A06

4. What frequency range would you normally tune to find EME signals in the 2 meter band?

E4D14

5. Which of the following is a way to reduce the likelihood of receiver desensitization?

E7H09

6. What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter and a low-pass anti-alias filter?

E4C11

7. Which of the following is a desirable amount of selectivity for an amateur SSB phone receiver?

E3C06

8. By how much does the VHF/UHF radio-path horizon distance exceed the geometric horizon?

E1D07

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

E1E08

10. To which of the following examinees may a VE not administer an examination?

E9D04

11. Why is it desirable for a ground-mounted satellite communications antenna system to be able to move in both azimuth and elevation?

E4A11

12. Which of these instruments could be used for detailed analysis of digital signals?

E9B08

13. How can the approximate beamwidth in a given plane of a directional antenna be determined?

E7F11

14. What is an advantage of a period-measuring frequency counter over a direct-count type?

E6B01

15. What is the most useful characteristic of a Zener diode?

E5C16

16. In polar coordinates, what is the impedance of a circuit that has an admittance of 7.09 millisiemens at 45 degrees?

E2E08

17. Which of the following HF digital modes can be used to transfer binary files?

E9A07

18. What is a folded dipole antenna?

E6A03

19. What are the majority charge carriers in P-type semiconductor material?

E1A02

20. When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the lowest frequency at which a properly adjusted LSB emission will be totally within the band?

E9F02

21. Which of the following determines the velocity factor of a transmission line?

E5D04

22. What unit measures electrical energy stored in an electrostatic field?

Figure

E6C09

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

E7D16

24. When several electrolytic filter capacitors are connected in series to increase the operating voltage of a power supply filter circuit, why should resistors be connected across each capacitor?

E7B19

25. What is a klystron?

E3B10

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

E7A14

27. What is a JK flip-flop?

E4E10

28. What is a common characteristic of interference caused by a touch controlled electrical device?

E5A06

29. What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

E8B01

30. What is the term for the ratio between the frequency deviation of an RF carrier wave, and the modulating frequency of its corresponding FM-phone signal?

E2B11

31. What is the function of the Vertical Interval Signaling (VIS) code transmitted as part of an SSTV transmission?

E2C03

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

E7G14

33. What is the typical input impedance of an integrated circuit op-amp?

E9H05

34. What is the main drawback of a wire-loop antenna for direction finding?

E8C10

35. What spread-spectrum communications technique alters the center frequency of a conventional carrier many times per second in accordance with a pseudo-random list of channels?

E2A08

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

E8A01

37. What type of wave is made up of a sine wave plus all of its odd harmonics?

E9E10

38. Which of these choices is an effective way to match an antenna with a 100-ohm feed point impedance to a 50-ohm coaxial cable feed line?

E7E10

39. How does a diode detector function?

E7C12

40. Which of the following describes a Pi-L network used for matching a vacuum-tube final amplifier to a 50-ohm unbalanced output?

E1C05

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

E0A10

42. What material found in some electronic components such as high-voltage capacitors and transformers is considered toxic?

E1F06

43. What is the National Radio Quiet Zone?

E9G02

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

E9C02

45. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

E4B02

46. What is an advantage of using a bridge circuit to measure impedance?

E5B09

47. What is the relationship between the current through a capacitor and the voltage across a capacitor?

E6E01

48. What is a crystal lattice filter?

E2D02

49. What is the definition of baud?

E8D07

50. What is an electromagnetic wave?