Practice Exam

Element 4: Extra

E3B10

1. What is the cause of gray-line propagation?

Figure

E7B12

2. What type of circuit is shown in Figure E7-1?

E2E02

3. What do the letters FEC mean as they relate to digital operation?

E4C08

4. How might lowering the noise figure affect receiver performance?

E7A10

5. What is a truth table?

E4D10

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

E1F09

7. Which of the following conditions apply when transmitting spread spectrum emission?

E9A08

8. What is meant by antenna gain?

E2C10

9. Why might a DX station state that they are listening on another frequency?

E7H16

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

E9E05

11. How must the driven element in a 3-element Yagi be tuned to use a hairpin matching system?

E2A02

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

E9H09

13. Which of the following describes the construction of a receiving loop antenna?

E6D14

14. Which is NOT true of a charge-coupled device (CCD)?

E9C01

15. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

E8D06

16. What is the advantage of using a peak-reading wattmeter to monitor the output of a SSB phone transmitter?

Figure

E6A10

17. In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?

E1D11

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

E2D10

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

E7C10

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

E8B01

21. What is the term for the ratio between the frequency deviation of an RF carrier wave, and the modulating frequency of its corresponding FM-phone signal?

E9F11

22. What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?

E7F07

23. What determines the accuracy of a frequency counter?

E1A13

24. Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?

E8A15

25. What would the waveform of a stream of digital data bits look like on a conventional oscilloscope?

E6F03

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

E7G02

27. What is the effect of ringing in a filter?

E7D05

28. Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?

E1C03

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

E5D02

30. Why is the resistance of a conductor different for RF currents than for direct currents?

E9G01

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

E6B13

32. What type of bias is required for an LED to emit light?

E6C01

33. What is the recommended power supply voltage for TTL series integrated circuits?

E4E01

34. Which of the following types of receiver noise can often be reduced by use of a receiver noise blanker?

E3A08

35. When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?

E5A04

36. What is the magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance?

E6E04

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

E5C18

38. In polar coordinates, what is the impedance of a series circuit consisting of a resistance of 4 ohms, an inductive reactance of 4 ohms, and a capacitive reactance of 1 ohm?

E7E08

39. What are the principal frequencies that appear at the output of a mixer circuit?

E9D06

40. Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

E5B09

41. What is the relationship between the current through a capacitor and the voltage across a capacitor?

Figure

E9B01

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

E1B12

43. What is the highest modulation index permitted at the highest modulation frequency for angle modulation?

E2B07

44. What is the name of the signal component that carries color information in NTSC video?

E4A03

45. Which of the following parameters would a spectrum analyzer display on the vertical axis?

E0A10

46. What material found in some electronic components such as high-voltage capacitors and transformers is considered toxic?

E1E14

47. For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?

E8C12

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

E4B11

49. How should a portable antenna analyzer be connected when measuring antenna resonance and feed point impedance?

E3C01

50. Which of the following effects does Aurora activity have on radio communications?