Practice Exam

Element 4: Extra

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E9H07

1. Why is it advisable to use an RF attenuator on a receiver being used for direction finding?

E1F05

2. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

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Figure

E9B03

3. In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?

E1D05

4. What class of licensee is authorized to be the control operator of a space station?

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E9C13

5. What is the main effect of placing a vertical antenna over an imperfect ground?

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E9G08

6. What is the process of normalization with regard to a Smith chart?

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E7A03

7. Which of the following can divide the frequency of a pulse train by 2?

E1C11

8. Which of the following operating arrangements allows an FCC-licensed U.S. citizen to operate in many European countries, and alien amateurs from many European countries to operate in the U.S.?

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E6F09

9. What is the efficiency of a photovoltaic cell?

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E3A08

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

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E2A03

11. What is the orbital period of an Earth satellite?

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E9D01

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

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E2D10

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

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E8B11

14. What is digital time division multiplexing?

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E7D03

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

E1E03

16. What is a Volunteer Examiner Coordinator?

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E3C04

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

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E8D04

18. What is the primary effect of extremely short rise or fall time on a CW signal?

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E6C06

19. Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

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E7F05

20. How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?

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E9A06

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

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Figure

E7G07

22. What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?

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E3B14

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

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E6A07

24. Which of the following indicates that a silicon NPN junction transistor is biased on?

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E7E09

25. What occurs when an excessive amount of signal energy reaches a mixer circuit?

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E4D01

26. What is meant by the blocking dynamic range of a receiver?

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E9F09

27. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?

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E2C04

28. What type of transmission is most often used for a ham radio mesh network?

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E7H09

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

E1B04

30. What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historical Places?

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E6E12

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

E1A10

32. If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?

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E4E14

33. What is one type of electrical interference that might be caused by the operation of a nearby personal computer?

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E6B09

34. What is a common use for point contact diodes?

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E5D17

35. How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?

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E4C07

36. What does the MDS of a receiver represent?

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E5B01

37. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage?

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E6D16

38. What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?

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E7B02

39. What is a Class D amplifier?

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Figure

E5C14

40. Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?

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E7C06

41. What are the distinguishing features of an elliptical filter?

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E8C11

42. What is the relationship between symbol rate and baud?

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E4A06

43. What is the effect of aliasing in a digital or computer-based oscilloscope?

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E5A05

44. What is the magnitude of the current at the input of a series RLC circuit as the frequency goes through resonance?

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E8A13

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

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E9E07

46. What term best describes the interactions at the load end of a mismatched transmission line?

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E4B10

47. Which of the following describes a method to measure intermodulation distortion in an SSB transmitter?

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E2B04

48. What is blanking in a video signal?

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E0A03

49. Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?

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E2E11

50. What is the difference between direct FSK and audio FSK?