Practice Exam

Element 4: Extra

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

E3A17

1. What is meant by circularly polarized electromagnetic waves?

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

E8C05

2. What is the necessary bandwidth of a 13-WPM international Morse code transmission?

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E9H04

3. What is an advantage of using a shielded loop antenna for direction finding?

E1E04

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

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E4D05

5. What transmitter frequencies would cause an intermodulation-product signal in a receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?

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E4A11

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

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E7G08

7. How does the gain of an ideal operational amplifier vary with frequency?

E1F09

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

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E9G10

9. What do the arcs on a Smith chart represent?

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E5D11

10. What is the power factor of an R-L circuit having a 60 degree phase angle between the voltage and the current?

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E2D08

11. What type of packet frame is used to transmit APRS beacon data?

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E7B06

12. Which of the following amplifier types reduces or eliminates even order harmonics?

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E2B04

13. What is blanking in a video signal?

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E9C11

14. How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus rocky ground?

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E7E06

15. Why is de-emphasis commonly used in FM communications receivers?

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

E6F08

16. Why are optoisolators often used in conjunction with solid state circuits when switching 120VAC?

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Figure

E5C16

17. Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?

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E7D09

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

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E6A17

19. What are the names of the three terminals of a field-effect transistor?

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E4E06

20. What is a major cause of atmospheric static?

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E7F11

21. What sets the minimum detectable signal level for an SDR in the absence of atmospheric or thermal noise?

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E6E05

22. Which of the following noise figure values is typical of a low-noise UHF preamplifier?

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E5A16

23. What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?

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E8B05

24. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?

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E2E05

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

E1B01

26. Which of the following constitutes a spurious emission?

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E9F14

27. What impedance does a 1/2 wavelength transmission line present to a generator when the line is shorted at the far end?

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E4C10

28. Which of the following is a desirable amount of selectivity for an amateur RTTY HF receiver?

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E4B12

29. What is the significance of voltmeter sensitivity expressed in ohms per volt?

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E6B13

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

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E2C01

31. Which of the following is true about contest operating?

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E9A13

32. How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?

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E3B14

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

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E9B14

34. What type of information can be obtained by submitting the details of a proposed new antenna to a modeling program?

E1C03

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

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E9E08

36. Which of the following measurements is characteristic of a mismatched transmission line?

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E2A12

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

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E9D11

38. Which of the following types of conductors would be best for minimizing losses in a station's RF ground system?

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E8D01

39. Why are received spread spectrum signals resistant to interference?

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E3C05

40. What orientation of Bz (B sub z) increases the likelihood that incoming particles from the Sun will cause disturbed conditions?

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E7C11

41. Which of the following is the common name for a filter network which is equivalent to two L-networks connected back-to-back with the two inductors in series and the capacitors in shunt at the input and output?

E1D10

42. Which amateur stations are eligible to be telecommand stations?

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Figure

E6C10

43. In Figure E6-5, what is the schematic symbol for a NOR gate?

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E7A01

44. Which is a bi-stable circuit?

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E8A04

45. What is "dither" with respect to analog to digital converters?

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E0A07

46. How may dangerous levels of carbon monoxide from an emergency generator be detected?

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

E7H15

47. Which of these functions can be performed by a phase-locked loop?

E1A07

48. Which amateur band requires transmission on specific channels rather than on a range of frequencies?

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E6D07

49. What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?

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

E5B05

50. What happens to the magnitude of a reactance when it is converted to a susceptance?