Practice Exam

Element 4: Extra

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

E4C15

1. What is usually the primary source of noise that is heard from an HF receiver with an antenna connected?

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

E8A05

2. What would be the most accurate way of measuring the RMS voltage of a complex waveform?

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E5B09

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

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E8B01

4. 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?

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E4B08

5. Which of the following is a characteristic of a good DC voltmeter?

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E4E11

6. Which is the most likely cause if you are hearing combinations of local AM broadcast signals within one or more of the MF or HF ham bands?

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E6C01

7. What is the function of hysteresis in a comparator?

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E3A11

8. What is a typical range for tropospheric propagation of microwave signals?

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E3B06

9. Which of the following amateur bands most frequently provides long-path propagation?

E1B09

10. Which amateur stations may be operated under RACES rules?

E1A03

11. With your transceiver displaying the carrier frequency of phone signals, you hear a station calling CQ on 14.349 MHz USB. Is it legal to return the call using upper sideband on the same frequency?

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

E6D04

12. Which materials are commonly used as a slug core in a variable inductor?

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E3C02

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

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E7C03

14. What advantage does a Pi-L-network have over a regular Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?

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E7B15

15. What is one way to prevent thermal runaway in a bipolar transistor amplifier?

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E4D01

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

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E7D03

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

E1D03

18. What is a telecommand station in the amateur satellite service?

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

E9A03

19. Why would one need to know the feed point impedance of an antenna?

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

E6A12

20. Why do many MOSFET devices have internally connected Zener diodes on the gates?

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E7H03

21. How is positive feedback supplied in a Hartley oscillator?

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E5D06

22. In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

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E2E13

23. Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

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E8C10

24. What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits?

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Figure

E5C17

25. Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?

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

E5A15

26. Which of the following can increase Q for inductors and capacitors?

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E9B07

27. How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from an isotropic antenna, assuming each is driven by the same amount of power?

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E2C10

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

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E7A04

29. How many flip-flops are required to divide a signal frequency by 4?

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E6B09

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

E1F12

31. Who may be the control operator of an auxiliary station?

E1C01

32. What is a remotely controlled station?

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

E9E11

33. What is an effective way of matching a feed line to a VHF or UHF antenna when the impedances of both the antenna and feed line are unknown?

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E2D11

34. Which of the following data are used by the APRS network to communicate your location?

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E4A07

35. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

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

E6E11

36. What is a characteristic of DIP packaging used for integrated circuits?

E1E05

37. What is the minimum passing score on amateur operator license examinations?

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E7F07

38. What function can a Fast Fourier Transform perform?

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E9D13

39. What usually occurs if a Yagi antenna is designed solely for maximum forward gain?

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E6F14

40. Which of the following is true of LCD displays?

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E8D12

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

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E9F02

42. Which of the following determines the velocity factor of a transmission line?

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E2A11

43. What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?

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Figure

E9G07

44. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

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E7E03

45. How does an analog phase modulator function?

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

E2B19

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

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

E7G06

47. Which of the following is the most appropriate use of an op-amp active filter?

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

E9C12

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

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

E9H02

49. Which is generally true for low band (160 meter and 80 meter) receiving antennas?

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

E0A11

50. Which of the following injuries can result from using high-power UHF or microwave transmitters?