Practice Exam

Element 4: Extra

E2C08

1. Which of the following contacts may be confirmed through the U.S. QSL bureau system?

E4E11

2. What could cause local AM broadcast band signals to combine to generate spurious signals in the MF or HF bands?

E5D13

3. How many watts are consumed in a circuit consisting of a 100-ohm resistor in series with a 100-ohm inductive reactance drawing 1 ampere?

E6F06

4. Which of these materials is most commonly used to create photoconductive devices?

E9E02

5. What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?

E1C09

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

E9B07

7. How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from a theoretical isotropic antenna, assuming each is driven by the same amount of power?

E4B09

8. What is indicated if the current reading on an RF ammeter placed in series with the antenna feed line of a transmitter increases as the transmitter is tuned to resonance?

E8C09

9. Which digital code allows only one bit to change between sequential code values?

E7A01

10. Which circuit is bistable?

E7E03

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

E5B05

12. What happens to the magnitude of a pure reactance when it is converted to a susceptance?

E7H09

13. What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?

E1D11

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

E3A07

15. Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

E1F07

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

E4C06

17. A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?

E6D11

18. Which type of core material decreases inductance when inserted into a coil?

E9G02

19. What type of coordinate system is used in a Smith chart?

E8A05

20. What of the following instruments would be the most accurate for measuring the RMS voltage of a complex waveform?

E7C10

21. Which of the following filters would be the best choice for use in a 2 meter band repeater duplexer?

E3C13

22. What type of polarization is best for ground-wave propagation?

E7B03

23. Which of the following components form the output of a class D amplifier circuit?

E2D09

24. What type of modulation is used for JT65 contacts?

E5A02

25. What is resonance in an LC or RLC circuit?

E1B06

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

E9C05

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

E9H11

28. What feature of a cardioid pattern antenna makes it useful for direction finding?

E9F08

29. Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric cable, assuming all other parameters are the same?

E6E01

30. Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?

E9D09

31. What is the function of a loading coil used as part of an HF mobile antenna?

E6B06

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

E1E04

33. Which of the following best describes the Volunteer Examiner accreditation process?

E3B12

34. What is the primary characteristic of chordal hop propagation?

E0A06

35. Why are there separate electric (E) and magnetic (H) field MPE limits?

E6C09

36. What is a Programmable Logic Device (PLD)?

E7G06

37. What is the gain-bandwidth of an operational amplifier?

E8D01

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

E4D08

39. What causes intermodulation in an electronic circuit?

E7D02

40. What is a characteristic of a switching electronic voltage regulator?

E1A10

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

E8B09

42. What is deviation ratio?

E2A10

43. What type of satellite appears to stay in one position in the sky?

E2E12

44. How do ALE stations establish contact?

E6A07

45. Which of the following indicates that a silicon NPN junction transistor is biased on?

E5C01

46. Which of the following represents capacitive reactance in rectangular notation?

E7F03

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

E2B12

48. What signals SSTV receiving software to begin a new picture line?

E9A05

49. What is included in the total resistance of an antenna system?

E4A02

50. Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?