Practice Exam

Element 4: Extra

E2C10

1. Why do DX stations often transmit and receive on different frequencies?

E7E05

2. What is added to an FM speech channel to boost the higher audio frequencies?

E2B05

3. Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

E8D10

4. What are some of the differences between the Baudot digital code and ASCII?

E8A05

5. What is the benefit of making voltage measurements with a true-RMS calculating meter?

E6D12

6. What causes inductor saturation?

E7A02

7. What is the function of a decade counter?

E3B05

8. Which of the following paths is most likely to support long-distance propagation on 160 meters?

E3A10

9. What determines the speed of electromagnetic waves through a medium?

E9F11

10. What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is open at the far end?

E1F02

11. What privileges are authorized in the US to persons holding an amateur service license granted by the government of Canada?

E0A03

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

E1A04

13. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?

E9H08

14. What is the function of a sense antenna?

E5D03

15. What is the phase relationship between current and voltage for reactive power?

Figure

E7D08

16. What type of circuit is shown in Figure E7-2?

Figure

E5C11

17. Which point in Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and an 18-microhenry inductor at 3.505 MHz?

E9C05

18. What is the purpose of feeding an off-center-fed dipole (OCFD) between the center and one end instead of at the midpoint?

E6B06

19. Which of the following is a common use of a Schottky diode?

E9G03

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

E4D02

21. Which of the following describes problems caused by poor dynamic range in a receiver?

E9E08

22. What is a use for a Wilkinson divider?

E1D07

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

E4B10

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

E7B04

25. What is the operating point of a Class A common emitter amplifier?

E8C12

26. What factors affect the bandwidth of a transmitted CW signal?

E7H05

27. How is positive feedback supplied in a Pierce oscillator?

E8B02

28. How does the modulation index of a phase-modulated emission vary with RF carrier frequency?

E5B12

29. What is admittance?

E9D11

30. Why do most two-element Yagis with normal spacing have a reflector instead of a director?

E6A02

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

E7G08

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

E1C10

33. What is the maximum mean power level for a spurious emission below 30 MHz with respect to the fundamental emission?

E9A09

34. What is antenna efficiency?

E6F10

35. What is the most common material used in power-generating photovoltaic cells?

E2A08

36. Why should effective radiated power (ERP) be limited to a satellite that uses a linear transponder?

E3C06

37. How does the VHF/UHF radio horizon compare to the geographic horizon?

E9B07

38. What is the difference in radiated power between a lossless antenna with gain and an isotropic radiator driven by the same power?

E7F11

39. What sets the minimum detectable signal level for a direct-sampling software defined receiver in the absence of atmospheric or thermal noise?

E4A06

40. What is the effect of aliasing on a digital oscilloscope when displaying a waveform?

E2D04

41. What technology is used for real-time tracking of balloons carrying amateur radio transmitters?

E4E08

42. What current flows equally on all conductors of an unshielded multiconductor cable?

E6E03

43. Which of the following materials supports the highest frequency of operation when used in MMICs?

E7C10

44. Which of the following filters is used in a 2-meter band repeater duplexer?

E2E04

45. Which of the following is characteristic of the FST4 mode?

E5A02

46. What is the resonant frequency of an RLC circuit if R is 22 ohms, L is 50 microhenries, and C is 40 picofarads?

E1B09

47. Which amateur stations may be operated under RACES rules?

E6C03

48. What is tri-state logic?

E1E01

49. For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?

E4C08

50. An SDR receiver is overloaded when input signals exceed what level?