Practice Exam

Element 4: Extra

E9E11

1. What is the primary purpose of phasing lines when used with an antenna having multiple driven elements?

E9B07

2. 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?

E3A06

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

E2A06

4. What are Keplerian elements?

E8A03

5. What type of wave does a Fourier analysis show to be made up of sine waves of a given fundamental frequency plus all its harmonics?

E5B03

6. How is impedance in polar form converted to an equivalent admittance?

E6E03

7. Which of the following materials is likely to provide the highest frequency of operation when used in MMICs?

E5C09

8. When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent?

E7E07

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

E2B05

10. Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

E6A12

11. Why do many MOSFET devices have internally connected Zener diodes on the gates?

Figure

E6C10

12. In Figure E6-3, what is the schematic symbol for a NOR gate?

E7H13

13. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?

E7F13

14. What is the function of taps in a digital signal processing filter?

E8B10

15. What is frequency division multiplexing?

E8D06

16. What is the advantage of including parity bits in ASCII characters?

E3C04

17. What does the value of Bz (B sub Z) represent?

E7B17

18. Why are odd-order rather than even-order intermodulation distortion products of concern in linear power amplifiers?

E9F12

19. What impedance does a 1/4-wavelength transmission line present to a generator when the line is open at the far end?

E9H04

20. What is an advantage of placing a grounded electrostatic shield around a small loop direction-finding antenna?

E6B11

21. What is used to control the attenuation of RF signals by a PIN diode?

E9C05

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

E6F03

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

E5D07

24. How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?

E5A08

25. What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

E1A09

26. What action or actions should you take if your digital message forwarding station inadvertently forwards a communication that violates FCC rules?

E2E07

27. Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

E4B01

28. Which of the following factors most affects the accuracy of a frequency counter?

E4C13

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

E6D12

30. What is inductor saturation?

E1F03

31. Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

E0A04

32. 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?

E9A13

33. What term describes station output, taking into account all gains and losses?

E3B01

34. What is transequatorial propagation?

E8C10

35. How may data rate be increased without increasing bandwidth?

E9D07

36. What is an advantage of using top loading in a shortened HF vertical antenna?

E1C03

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

E1D03

38. What is a space telecommand station?

E7C09

39. What is a crystal lattice filter?

E4E11

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

E7D03

41. What device is typically used as a stable voltage reference in a linear voltage regulator?

Figure

E7G09

42. What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

E1E04

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

E4A05

44. What is the purpose of the prescaler function on a frequency counter?

E7A08

45. What logical operation does an OR gate perform?

E1B09

46. Which amateur stations may be operated under RACES rules?

E2D04

47. What technology is used to track, in real time, balloons carrying amateur radio transmitters?

E2C09

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

E4D12

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

E9G09

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