Practice Exam

Element 4: Extra (EXPIRED)

E4E05

1. How can noise from an electric motor be suppressed?

E9D15

2. Which of the following would provide the best RF ground for your station?

E7F09

3. What is the purpose of a frequency counter?

E8C05

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

E9F15

5. What impedance does a 1/2-wavelength transmission line present to a generator when the line is open at the far end?

E2B10

6. Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?

Figure

E6C08

7. In Figure E6-5, what is the schematic symbol for a NAND gate?

E9A14

8. How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?

E5B12

9. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms?

E5D09

10. What happens to reactive power in an AC circuit that has both ideal inductors and ideal capacitors?

E3A01

11. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?

E2E10

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

E4C12

13. What is an undesirable effect of using too wide a filter bandwidth in the IF section of a receiver?

E3B03

14. What is the best time of day for transequatorial propagation?

E9C04

15. Which of the following describes a basic unterminated rhombic antenna?

E4A01

16. How does a spectrum analyzer differ from an oscilloscope?

E8D03

17. What input-amplitude parameter is valuable in evaluating the signal-handling capability of a Class A amplifier?

E4D12

18. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

E0A07

19. How may dangerous levels of carbon monoxide from an emergency generator be detected?

Figure

E6B10

20. In Figure E6-3, what is the schematic symbol for a light-emitting diode?

E1E10

21. What must the administering VEs do after the administration of a successful examination for an amateur operator license?

E9H08

22. What is the function of a sense antenna?

E9B07

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

E7G03

24. Which of the following is an advantage of using an op-amp instead of LC elements in an audio filter?

E7B20

25. What is a parametric amplifier?

E6E03

26. What is one aspect of the piezoelectric effect?

E2D07

27. Which of the following digital protocols is used by APRS?

E7C01

28. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

E5A10

29. What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 1.8 MHz and a Q of 95?

E5C03

30. In polar coordinates, what is the impedance of a network consisting of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series?

E7A14

31. What is a JK flip-flop?

E9E12

32. What is the primary purpose of a phasing line when used with an antenna having multiple driven elements?

Figure

E7D09

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

E6D16

34. What is one reason for using ferrite toroids rather than powdered-iron toroids in an inductor?

E1D11

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

E2A02

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

E1A05

37. What is the maximum power output permitted on the 60 meter band?

E8A14

38. Which of these methods is commonly used to convert analog signals to digital signals?

E4B07

39. Which of the following is good practice when using an oscilloscope probe?

E6A01

40. In what application is gallium arsenide used as a semiconductor material in preference to germanium or silicon?

E1B09

41. Which amateur stations may be operated in RACES?

E1C06

42. Which of the following statements concerning remotely controlled amateur stations is true?

E3C04

43. Which emission mode is best for Aurora propagation?

E2C03

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

E7E05

45. What circuit is added to an FM transmitter to boost the higher audio frequencies?

E6F12

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

E9G01

47. Which of the following can be calculated using a Smith chart?

E1F13

48. What types of communications may be transmitted to amateur stations in foreign countries?

E7H16

49. Why is the short-term stability of the reference oscillator important in the design of a phase locked loop (PLL) frequency synthesizer?

E8B06

50. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?