Practice Exam

Element 4: Extra

Study material for this question can be found in the following resources:

E9B13

1. What does the abbreviation NEC stand for when applied to antenna modeling programs?

Study material for this question can be found in the following resources:

E7E02

2. What is the function of a reactance modulator?

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E3B03

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

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E2E01

4. Which type of modulation is common for data emissions below 30 MHz?

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E7C04

5. How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

Study material for this question can be found in the following resources:

E5A14

6. What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50 microhenrys and C is 40 picofarads?

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E8A03

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

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E8C02

8. What is the definition of symbol rate in a digital transmission?

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E6F04

9. What is the photovoltaic effect?

Study material for this question can be found in the following resources:

E7B16

10. What is the effect of intermodulation products in a linear power amplifier?

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E4C13

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

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E9F07

12. How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?

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E9H06

13. What is the triangulation method of direction finding?

Study material for this question can be found in the following resources:

E5C05

14. What is the name of the diagram used to show the phase relationship between impedances at a given frequency?

E1C03

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

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E2D01

16. Which of the following digital modes is especially designed for use for meteor scatter signals?

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E4E02

17. Which of the following types of receiver noise can often be reduced with a DSP noise filter?

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E7D01

18. What is one characteristic of a linear electronic voltage regulator?

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E7F13

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

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E5D13

20. How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere?

E1E04

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

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E6E03

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

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E3C03

23. Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?

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E6C07

24. What best describes a pull-up or pull-down resistor?

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E9A06

25. How does the beamwidth of an antenna vary as the gain is increased?

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E0A02

26. When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

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E8D06

27. Which of the following indicates likely overmodulation of an AFSK signal such as PSK or MFSK?

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Figure

E7G10

28. What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?

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E6A04

29. What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?

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E9E01

30. What system matches a higher impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places spaced a fraction of a wavelength each side of element center?

E1B07

31. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

E1F04

32. Which of the following geographic descriptions approximately describes "Line A"?

E2A14

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

Study material for this question can be found in the following resources:

E6D01

34. How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?

Study material for this question can be found in the following resources:

E9D04

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

Study material for this question can be found in the following resources:

E7A09

36. What logical operation is performed by an exclusive NOR gate?

E1D04

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

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E5B09

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

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E9C12

39. Which of the following describes an extended double Zepp antenna?

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E4A11

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

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Figure

E9G05

41. What type of chart is shown in Figure E9-3?

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E3A10

42. Which type of atmospheric structure can create a path for microwave propagation?

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E4B01

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

E1A05

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

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E7H09

45. What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?

Study material for this question can be found in the following resources:

E8B01

46. 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?

Study material for this question can be found in the following resources:

E4D11

47. Why are third-order intermodulation products created within a receiver of particular interest compared to other products?

Study material for this question can be found in the following resources:

E6B12

48. What is one common use for PIN diodes?

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E2B15

49. What signals SSTV receiving equipment to begin a new picture line?

Study material for this question can be found in the following resources:

E2C12

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