Practice Exam

Element 4: Extra

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E5B04

1. What is the time constant of a circuit having two 220 microfarad capacitors and two 1 megohm resistors, all in parallel?

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E7E03

2. How does an analog phase modulator function?

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E9D01

3. How does the gain of an ideal parabolic dish antenna change when the operating frequency is doubled?

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E7G01

4. What is the typical output impedance of an integrated circuit op-amp?

E1E13

5. Which of these choices is an acceptable method for monitoring the applicants if a VEC opts to conduct an exam session remotely?

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E9C14

6. How does the performance of a horizontally polarized antenna mounted on the side of a hill compare with the same antenna mounted on flat ground?

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E0A08

7. What does SAR measure?

E1B10

8. What frequencies are authorized to an amateur station operating under RACES rules?

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E6D17

9. Why should core saturation of a conventional impedance matching transformer be avoided?

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E6A04

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

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E8B07

11. Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?

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E5D04

12. Why are short connections necessary at microwave frequencies?

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E2B19

13. What special operating frequency restrictions are imposed on slow scan TV transmissions?

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E6E12

14. Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?

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E4E08

15. What type of signal is picked up by electrical wiring near a radio antenna?

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E9G03

16. Which of the following is often determined using a Smith chart?

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E7D09

17. What is the main reason to use a charge controller with a solar power system?

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E4B11

18. How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance?

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E6B04

19. What type of semiconductor device is designed for use as a voltage-controlled capacitor?

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E7B16

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

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E2A12

21. What is one way to predict the location of a satellite at a given time?

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E6F03

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

E1C06

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

E1A14

24. What is the maximum bandwidth for a data emission on 60 meters?

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E2E05

25. Which type of digital mode does not support keyboard-to-keyboard operation?

E1F04

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

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E7A12

27. What type of logic defines "0" as a high voltage?

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E4C13

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

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E2D06

29. Which of the following describes a method of establishing EME contacts?

E1D01

30. What is the definition of the term telemetry?

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E9F10

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

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E5C08

32. What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?

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E2C07

33. What is the Cabrillo format?

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E4D11

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

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E9H11

35. What characteristic of a cardioid pattern antenna is useful for direction finding?

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E3C02

36. What is indicated by a rising A or K index?

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E9A17

37. What is the effective radiated power of a repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain?

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E8D10

38. What are some of the differences between the Baudot digital code and ASCII?

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E7H13

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

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E7F02

40. What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?

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E8C03

41. When performing phase shift keying, why is it advantageous to shift phase precisely at the zero crossing of the RF carrier?

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E9B08

42. How can the approximate beam-width in a given plane of a directional antenna be determined?

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E5A13

43. What is an effect of increasing Q in a resonant circuit?

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E3A16

44. Which of the following best describes electromagnetic waves traveling in free space?

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E6C12

45. What is BiCMOS logic?

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E8A08

46. Why would a direct or flash conversion analog-to-digital converter be useful for a software defined radio?

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E3B14

47. What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?

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E9E04

48. What is the purpose of the series capacitor in a gamma-type antenna matching network?

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E4A04

49. What determines the upper frequency limit for a computer soundcard-based oscilloscope program?

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E7C02

50. Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?