Practice Exam

Element 4: Extra

E7A01

1. Which circuit is bistable?

E3A12

2. What is most likely to result in auroral propagation?

E9A08

3. Which frequency band has the smallest first Fresnel zone?

E2A02

4. Which of the following is characteristic of an inverting linear transponder?

E8B07

5. Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?

E7B02

6. What is a Class D amplifier?

E1F03

7. 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?

E9E07

8. What parameter describes the interaction of a load and transmission line?

E1E07

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

E7F03

10. What type of digital signal processing filter is used to generate an SSB signal?

E1B02

11. Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?

E7D05

12. Which of the following types of linear voltage regulator operates by loading the unregulated voltage source?

E6F11

13. What is the approximate open-circuit voltage produced by a fully illuminated silicon photovoltaic cell?

E5D07

14. What combines to create the self-resonance of a component?

E2E08

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

Figure

E7G09

16. What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

E6D07

17. What is the current that flows in the primary winding of a transformer when there is no load on the secondary winding?

E9D10

18. How does radiation resistance of a base-fed whip antenna change below its resonant frequency?

E2B09

19. What kind of receiver can be used to receive and decode SSTV using the Digital Radio Mondiale (DRM) protocol?

E6E06

20. What characteristics of MMICs make them a popular choice for VHF through microwave circuits?

E1A10

21. If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?

E7H13

22. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?

E5B05

23. What is the effect on the magnitude of pure reactance when it is converted to susceptance?

E2C06

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

Figure

E9B04

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

E4B10

26. Which of the following methods measures intermodulation distortion in an SSB transmitter?

E3B07

27. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation?

E2D06

28. Which of the following is a method for establishing EME contacts?

E6A02

29. Which of the following semiconductor materials contains excess free electrons?

E0A01

30. What is the primary function of an external earth connection or ground rod?

E9H07

31. What is the function of a Beverage antenna's termination resistor?

E1C04

32. What is an IARP?

E6B08

33. Which of the following is a Schottky barrier diode?

E4E04

34. How can conducted noise from an automobile battery charging system be suppressed?

E4D09

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

E8A04

36. What is "dither" with respect to analog-to-digital converters?

E8D11

37. What is one advantage of using ASCII code for data communications?

E4C11

38. Why does input attenuation reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?

E5C06

39. What does the impedance 50 - j25 ohms represent?

E1D07

40. Which of the following HF amateur bands include allocations for space stations?

E7E11

41. Which type of detector is used for demodulating SSB signals?

E9F03

42. Why is the electrical length of a coaxial cable longer than its physical length?

E9C08

43. What is a folded dipole antenna?

E6C05

44. Which of the following digital logic families has the lowest power consumption?

E5A05

45. What is the result of increasing the Q of an impedance-matching circuit?

E4A03

46. Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?

E7C04

47. How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

E8C10

48. How can data rate be increased without increasing bandwidth?

E3C07

49. Which of the following indicates the greatest solar flare intensity?

E9G09

50. What third family of circles is often added to a Smith chart during the process of designing impedance matching networks?