Practice Exam

Element 4: Extra

E9G05

1. Which of the following is a common use for a Smith chart?

E6C05

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

E4D09

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

E9H06

4. What indicates the correct value of terminating resistance for a Beverage antenna?

E8D11

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

E6A03

6. Why does a PN-junction diode not conduct current when reverse biased?

E7C03

7. What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?

E1A03

8. What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?

Figure

E9B01

9. What is the 3 dB beamwidth of the antenna radiation pattern shown in Figure E9-1?

Figure

E7G10

10. What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms?

E7F12

11. Which of the following is generally true of Finite Impulse Response (FIR) filters?

E7E05

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

E9F07

13. How does parallel conductor transmission line compare to coaxial cable with a plastic dielectric?

E2B01

14. In digital television, what does a coding rate of 3/4 mean?

E6F02

15. What happens to photoconductive material when light shines on it?

E9A04

16. Which of the following factors affect the feed point impedance of an antenna?

E1F08

17. Which of the following types of amateur station communications are prohibited?

E5D05

18. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF?

E5C03

19. Which of the following represents a pure inductive reactance in polar coordinates?

E7D10

20. Why is a switching type power supply less expensive and lighter than an equivalent linear power supply?

E8C07

21. What is the bandwidth of a 4,800-Hz frequency shift, 9,600-baud ASCII FM transmission?

E7B07

22. Which of the following is the likely result of using a Class C amplifier to amplify a single-sideband phone signal?

E4A01

23. Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?

E5B07

24. 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?

E0A02

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

E1C09

26. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

E3B05

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

E7A10

28. What is a truth table?

E3A02

29. What characterizes libration fading of an EME signal?

E9D12

30. What is the purpose of making a Yagi's parasitic elements either longer or shorter than resonance?

E5A12

31. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118?

E1B02

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

E1D04

33. Which of the following is required in the identification transmissions from a balloon-borne telemetry station?

E6E09

34. Which of the following component package types have the least parasitic effects at frequencies above the HF range?

E9E02

35. What antenna matching system matches coaxial cable to an antenna by connecting the shield to the center of the antenna and the conductor a fraction of a wavelength to one side?

E1E04

36. What is required to be accredited as a Volunteer Examiner?

E8B07

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

E2D11

38. How do APRS stations relay data?

E3C04

39. What does the value of Bz (B sub z) represent?

E7H12

40. Which of the following ensures that a crystal oscillator operates on the frequency specified by the crystal manufacturer?

E2E02

41. Which of the following synchronizes WSJT-X digital mode transmit/receive timing?

E4C02

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

E4E10

43. Which of the following can create intermittent loud roaring or buzzing AC line interference?

E6B08

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

E9C10

45. Which of the following describes a Zepp antenna?

E2C09

46. What type of equipment is commonly used to implement an amateur radio mesh network?

E2A06

47. What are Keplerian elements?

E6D12

48. What causes inductor saturation?

E8A02

49. Which of the following is a type of analog-to-digital conversion?

E4B05

50. What three test loads are used to calibrate an RF vector network analyzer?