Practice Exam

Element 4: Extra (EXPIRED)

E1F08

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

E7F01

2. What is the purpose of a prescaler circuit?

E3A07

3. What frequency range would you normally tune to find EME signals in the 70 cm band?

E0A04

4. When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

E1C10

5. What types of amateur stations may automatically retransmit the radio signals of other amateur stations?

E9E06

6. What is the equivalent lumped-constant network for a hairpin matching system on a 3-element Yagi?

E7G04

7. Which of the following is a type of capacitor best suited for use in high-stability op-amp RC active filter circuits?

E8A13

8. What is an advantage of using digital signals instead of analog signals to convey the same information?

E6E01

9. What is a crystal lattice filter?

E3C07

10. How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?

E8B08

11. What parameter does the modulating signal vary in a pulse-position modulation system?

E8C12

12. What is the advantage of including a parity bit with an ASCII character stream?

E6C05

13. Which of the following is an advantage of CMOS logic devices over TTL devices?

E1D03

14. What is a telecommand station in the amateur satellite service?

E4C13

15. How does a narrow-band roofing filter affect receiver performance?

E2A02

16. What is the direction of a descending pass for an amateur satellite?

E5D16

17. What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current?

E5B01

18. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage?

E8D14

19. Which of the following is a typical value for the peak-to-peak voltage at a standard U.S. household electrical outlet?

E7A05

20. Which of the following is a circuit that continuously alternates between two states without an external clock?

E5C05

21. In polar coordinates, what is the impedance of a network consisting of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor?

E7E07

22. What is meant by the term baseband in radio communications?

E4E13

23. What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

E9H06

24. What is the triangulation method of direction finding?

E6D06

25. What core material property determines the inductance of a toroidal inductor?

Figure

E7B10

26. In Figure E7-1, what is the purpose of R1 and R2?

E1B11

27. What is the permitted mean power of any spurious emission relative to the mean power of the fundamental emission from a station transmitter or external RF amplifier installed after January 1, 2003, and transmitting on a frequency below 30 MHZ?

E5A03

28. What is the magnitude of the impedance of a series RLC circuit at resonance?

E2E11

29. What is the difference between direct FSK and audio FSK?

E2B03

30. How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?

E9F05

31. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz?

E4D10

32. What does a third-order intercept level of 40 dBm mean with respect to receiver performance?

E9G09

33. What third family of circles is often added to a Smith chart during the process of solving problems?

E6F03

34. What is the most common configuration of an optoisolator or optocoupler?

E1A01

35. When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the highest frequency at which a properly adjusted USB emission will be totally within the band?

E9B04

36. What may occur when a directional antenna is operated at different frequencies within the band for which it was designed?

E7C07

37. What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

E9A13

38. How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?

E3B05

39. Which amateur bands typically support long-path propagation?

E2C12

40. What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?

E6A03

41. What are the majority charge carriers in P-type semiconductor material?

E6B08

42. Which of the following describes a type of semiconductor diode?

E4B14

43. What happens if a dip meter is too tightly coupled to a tuned circuit being checked?

E4A04

44. Which of the following test instruments is used to display spurious signals from a radio transmitter?

E9D02

45. How can linearly polarized Yagi antennas be used to produce circular polarization?

E7D14

46. What is one purpose of a "bleeder" resistor in a conventional (unregulated) power supply?

E2D12

47. How does JT65 improve EME communications?

E9C02

48. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

E1E02

49. Where are the questions for all written US amateur license examinations listed?

E7H06

50. Which of the following oscillator circuits are commonly used in VFOs?