Practice Exam

Element 4: Extra

E6B09

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

E2A11

2. What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

E3C05

3. What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?

E7H03

4. What is a phase-locked loop?

E5B07

5. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?

E1B06

6. Which of the following additional rules apply if you are erecting an amateur station antenna structure at a site at or near a public use airport?

E6D01

7. What is piezoelectricity?

E4E05

8. What is used to suppress radio frequency interference from a line-driven AC motor?

E4C11

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

E2B06

10. What is vestigial sideband modulation?

E9F01

11. What is the velocity factor of a transmission line?

Figure

E7G02

12. What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

E1C11

13. Which of the following operating arrangements allows an FCC-licensed US citizen to operate in many European countries, and amateurs from many European countries to operate in the US?

E9A08

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

E4B11

15. Which of the following can be measured with a vector network analyzer?

E9B08

16. What is the far field of an antenna?

E5D06

17. What parasitic characteristic creates an inductor's self-resonance?

E4D13

18. What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?

E1D11

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

E4A03

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

E5C06

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

E7B05

22. What can be done to prevent unwanted oscillations in an RF power amplifier?

E7A07

23. What logical operation does a NAND gate perform?

E8A01

24. What technique shows that a square wave is made up of a sine wave and its odd harmonics?

E1F07

25. When may an amateur station send a message to a business?

E7D13

26. Which of the following calculates power dissipated by a series linear voltage regulator?

E3A01

27. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?

E7F11

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

E9G04

29. What are the two families of circles and arcs that make up a Smith chart?

E6C09

30. What is used to design the configuration of a field-programmable gate array (FPGA)?

E9E04

31. What is the purpose of the series capacitor in a gamma match?

E1A10

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

E0A02

33. When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

E8C05

34. What is the approximate bandwidth of a 13-WPM International Morse Code transmission?

E7E06

35. Why is de-emphasis used in FM communications receivers?

E5A06

36. What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

E1E11

37. What must the VE team do if an examinee scores a passing grade on all examination elements needed for an upgrade or new license?

E2D04

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

E9D03

39. What is the most efficient location for a loading coil on an electrically short whip?

E6E04

40. Which is the most common input and output impedance of MMICs?

E6F01

41. What absorbs the energy from light falling on a photovoltaic cell?

E9H08

42. What is the function of a sense antenna?

E6A02

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

E8B03

44. What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?

E3B11

45. At what time of day is sporadic-E propagation most likely to occur?

E2E12

46. How do ALE stations establish contact?

E8D03

47. Which describes spread spectrum frequency hopping?

E7C06

48. What are the characteristics of an elliptical filter?

E9C13

49. How does the radiation pattern of a horizontally polarized antenna vary with increasing height above ground?

E2C12

50. What indicates the delay between a control operator action and the corresponding change in the transmitted signal?