Practice Exam

Element 4: Extra

E6D08

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

E9C02

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

E7A08

3. What logical operation does an OR gate perform?

E9G11

4. How are the wavelength scales on a Smith chart calibrated?

E2A03

5. What is the orbital period of an Earth satellite?

E9D07

6. What is a disadvantage of using a multiband trapped antenna?

E2D05

7. Which of the following techniques is normally used by low Earth orbiting digital satellites to relay messages around the world?

E8B09

8. What is meant by deviation ratio?

E5A17

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

E7G06

10. Which of the following is the most appropriate use of an op-amp active filter?

E3B04

11. What type of propagation is probably occurring if an HF beam antenna must be pointed in a direction 180 degrees away from a station to receive the strongest signals?

E5D08

12. What type of energy is stored in an electromagnetic or electrostatic field?

E1A02

13. 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?

E4C05

14. What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?

Figure

E9B01

15. In the antenna radiation pattern shown in Figure E9-1, what is the 3-dB beamwidth?

E1C08

16. What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?

E4B14

17. What happens if a dip meter is too tightly coupled to a tuned circuit being checked?

E1D10

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

E7B21

19. Which of the following devices is generally best suited for UHF or microwave power amplifier applications?

E5B03

20. The capacitor in an RC circuit is discharged to what percentage of the starting voltage after two time constants?

E9A05

21. Which of the following factors may affect the feed point impedance of an antenna?

E1B03

22. Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?

Figure

E6C09

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

E6E02

24. Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter?

E1E09

25. What may be the penalty for a VE who fraudulently administers or certifies an examination?

E4D12

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

E0A11

27. Which of the following injuries can result from using high-power UHF or microwave transmitters?

E6B06

28. Which of the following is a common use of a hot-carrier diode?

E2B13

29. How many lines are commonly used in each frame on an amateur slow-scan color television picture?

E2E04

30. What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?

E6A06

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

E5C15

32. In polar coordinates, what is the impedance of a circuit of 100 -j100 ohms impedance?

E6F03

33. What is the most common configuration of an optoisolator or optocoupler?

E3C02

34. What is the cause of Aurora activity?

E7E05

35. What circuit is added to an FM transmitter to boost the higher audio frequencies?

E7F03

36. What is the function of a decade counter digital IC?

E7H01

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

E8D03

38. What input-amplitude parameter is valuable in evaluating the signal-handling capability of a Class A amplifier?

E4E02

39. Which of the following types of receiver noise can often be reduced with a DSP noise filter?

E9F10

40. What impedance does a 1/8-wavelength transmission line present to a generator when the line is shorted at the far end?

E1F10

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

E8A14

42. Which of these methods is commonly used to convert analog signals to digital signals?

E7D15

43. What is the purpose of a "step-start" circuit in a high-voltage power supply?

E8C09

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

E3A07

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

E4A02

46. Which of the following parameters would a spectrum analyzer display on the horizontal axis?

E9H02

47. What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4-dB feed line loss, 3.2-dB duplexer loss, 0.8-dB circulator loss and 10-dBd antenna gain?

E7C11

48. 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 inductors in series and the capacitors in shunt at the input and output?

E9E08

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

E2C07

50. What is the Cabrillo format?