Practice Exam

Element 4: Extra

E8D04

1. What is the PEP output of a transmitter that develops a peak voltage of 30 volts into a 50-ohm load?

E3C13

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

E4A07

3. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

Figure

E7D09

4. What is the purpose of C1 in the circuit shown in Figure E7-3?

E4C11

5. Which of the following is a desirable amount of selectivity for an amateur SSB phone receiver?

E5C09

6. When using rectangular coordinates to graph the impedance of a circuit, what does the horizontal axis represent?

E2A13

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

E7A15

8. What is a D flip-flop?

E9D10

9. What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?

E7H18

10. What are the major spectral impurity components of phase-locked loop synthesizers?

E6E04

11. What is the most common input and output impedance of circuits that use MMICs?

E7C02

12. A T-network with series capacitors and a parallel shunt inductor has which of the following properties?

E8C05

13. What is the necessary bandwidth of a 13-WPM international Morse code transmission?

E1B03

14. Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?

E5A07

15. What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

E1A09

16. What is the first action you should take if your digital message forwarding station inadvertently forwards a communication that violates FCC rules?

Figure

E9B01

17. In the antenna radiation pattern shown in Figure E9-1, what is the 3-dB beamwidth?

E2B09

18. What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?

E9H01

19. What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2-dB feed line loss, 2.2-dB duplexer loss and 7-dBd antenna gain?

E9A08

20. What is meant by antenna gain?

E7B19

21. What is a klystron?

E6B02

22. What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?

E7F07

23. What determines the accuracy of a frequency counter?

E2C03

24. From which of the following bands is amateur radio contesting generally excluded?

Figure

E9C10

25. How many elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2?

E5D14

26. What is reactive power?

E8B09

27. What is meant by deviation ratio?

E1F08

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

E9F04

29. What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

E6F12

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

E6D13

31. What type of CRT deflection is better when high-frequency waveforms are to be displayed on the screen?

E8A03

32. What type of wave is made up of sine waves of a given fundamental frequency plus all its harmonics?

E4E13

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

E4B13

34. How is the compensation of an oscilloscope probe typically adjusted?

E1D04

35. What is an Earth station in the amateur satellite service?

Figure

E6C09

36. In Figure E6-5, what is the schematic symbol for an OR gate?

E3A02

37. What characterizes libration fading of an Earth-Moon-Earth signal?

E5B11

38. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

E7G12

39. What is an integrated circuit operational amplifier?

E9E09

40. Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?

Figure

E9G07

41. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

E4D13

42. Which of the following can cause receiver desensitization?

E7E14

43. What is meant by direct conversion when referring to a software defined receiver?

E3B11

44. Which of the following describes gray-line propagation?

E2D10

45. How can an APRS station be used to help support a public service communications activity?

E1E02

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

E6A14

47. How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?

E1C03

48. How do the control operator responsibilities of a station under automatic control differ from one under local control?

E2E10

49. Which of these digital communications modes has the narrowest bandwidth?

E0A11

50. Which of the following injuries can result from using high-power UHF or microwave transmitters?