Practice Exam

Element 4: Extra

E9B05

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

E5D11

2. What is the power factor of an R-L circuit having a 60 degree phase angle between the voltage and the current?

E6F08

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

E2C09

4. How does the spread-spectrum technique of frequency hopping work?

E8C13

5. What is one advantage of using JT-65 coding?

E1E02

6. Where are the questions for all written US amateur license examinations listed?

E9G02

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

E8B12

8. What is digital time division multiplexing?

E5B06

9. How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?

E1D10

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

E7A07

11. What logical operation does a NAND gate perform?

E6D14

12. Which is NOT true of a charge-coupled device (CCD)?

E2A06

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

E3B09

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

E7G04

15. Which of the following is a type of capacitor best suited for use in high-stability op-amp RC active filter circuits?

E6B03

16. What special type of diode is capable of both amplification and oscillation?

E9E09

17. Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?

E6E08

18. How is power-supply voltage normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?

E1B12

19. What is the highest modulation index permitted at the highest modulation frequency for angle modulation?

E7C09

20. What type of digital signal processing filter might be used to generate an SSB signal?

E1A11

21. What authorization or licensing is required when operating an amateur station aboard a US-registered vessel in international waters?

E4B02

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

E5A05

23. What is the magnitude of the current at the input of a series RLC circuit as the frequency goes through resonance?

E8A05

24. What would be the most accurate way of measuring the RMS voltage of a complex waveform?

E9D07

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

E4C14

26. On which of the following frequencies might a signal be transmitting which is generating a spurious image signal in a receiver tuned to 14.300 MHz and which uses a 455 kHz IF frequency?

E7B06

27. Which of the following amplifier types reduces or eliminates even-order harmonics?

E7D03

28. What device is typically used as a stable reference voltage in a linear voltage regulator?

E0A06

29. Why are there separate electric (E) and magnetic (H) field MPE limits?

E9H12

30. What is an advantage of using a shielded loop antenna for direction finding?

E9F03

31. Why is the physical length of a coaxial cable transmission line shorter than its electrical length?

E7H13

32. What is the capture range of a phase-locked loop circuit?

E1C05

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

E2B16

34. Which of the following is the video standard used by North American Fast Scan ATV stations?

E2D05

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

E8D09

36. What is meant by circularly polarized electromagnetic waves?

Figure

E9C09

37. What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?

Figure

E5C23

38. 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?

E3C14

39. Why does the radio-path horizon distance exceed the geometric horizon?

E3A06

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

E7E08

41. What are the principal frequencies that appear at the output of a mixer circuit?

E6C03

42. Which of the following describes tri-state logic?

E2E03

43. How is Forward Error Correction implemented?

E9A14

44. How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?

E7F09

45. What is the purpose of a frequency counter?

E4E13

46. What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

Figure

E6A11

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

E4A09

48. Which of the following describes a good method for measuring the intermodulation distortion of your own PSK signal?

E1F03

49. Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

E4D06

50. What is the term for unwanted signals generated by the mixing of two or more signals?