Practice Exam

Element 4: Extra

E5A15

1. Which of the following increases Q for inductors and capacitors?

E7E03

2. What is a frequency discriminator stage in a FM receiver?

E0A03

3. Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

E4A07

4. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

E8D01

5. Why are received spread spectrum signals resistant to interference?

E1C08

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

E2B03

7. How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?

E4C02

8. Which of the following receiver circuits can be effective in eliminating interference from strong out-of-band signals?

E7G08

9. How does the gain of an ideal operational amplifier vary with frequency?

E6F04

10. What is the photovoltaic effect?

E9F05

11. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 14.1 MHz?

E9C05

12. Which of the following is a type of OCFD antenna?

E6B09

13. What is a common use for point-contact diodes?

E2A05

14. What do the letters in a satellite's mode designator specify?

E6D01

15. Why should core saturation of an impedance matching transformer be avoided?

E9A11

16. Which of the following factors determines ground losses for a ground-mounted vertical antenna operating in the 3 MHz to 30 MHz range?

E4B01

17. Which of the following factors most affects the accuracy of a frequency counter?

E9E06

18. Which of these feed line impedances would be suitable for constructing a quarter-wave Q-section for matching a 100-ohm loop to 50-ohm feed line?

E8B01

19. What is the modulation index of an FM signal?

E5C08

20. What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?

E9H06

21. What is the triangulation method of direction finding?

E6A08

22. What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

E7H08

23. Which of the following components can be used to reduce thermal drift in crystal oscillators?

E7D11

24. What is the function of the pass transistor in a linear voltage regulator circuit?

E8A08

25. Why would a direct or flash conversion analog-to-digital converter be useful for a software defined radio?

Figure

E9B06

26. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

E8C10

27. How may data rate be increased without increasing bandwidth?

E2C06

28. During a VHF/UHF contest, in which band segment would you expect to find the highest level of SSB or CW activity?

E5D12

29. How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100 VAC at 4 amperes?

E2E06

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

E5B01

31. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage?

E6C02

32. What happens when the level of a comparator's input signal crosses the threshold?

E3A06

33. What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?

E7C06

34. What are the distinguishing features of an elliptical filter?

E7A01

35. Which circuit is bistable?

E1A11

36. Which of the following describes authorization or licensing required when operating an amateur station aboard a U.S.-registered vessel in international waters?

E9D04

37. Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

E4E04

38. How can conducted and radiated noise caused by an automobile alternator be suppressed?

E6E07

39. What type of transmission line is used for connections to MMICs?

E1D11

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

E1F09

41. Which of the following conditions apply when transmitting spread spectrum emissions?

E1E07

42. What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?

E7F08

43. What is the function of decimation?

E9G03

44. Which of the following is often determined using a Smith chart?

E3B07

45. What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?

E2D05

46. What is one advantage of the JT65 mode?

E7B18

47. What is a characteristic of a grounded-grid amplifier?

E4D09

48. What is the purpose of the preselector in a communications receiver?

E3C09

49. How does the intensity of an X3 flare compare to that of an X2 flare?

E1B10

50. What frequencies are authorized to an amateur station operating under RACES rules?