Practice Exam

Element 4: Extra

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E7G03

1. What is the typical input impedance of an integrated circuit op-amp?

E1C06

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

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E8D05

3. What is the most common method of reducing key clicks?

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E8A04

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

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E6E06

5. What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?

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E9H09

6. Which of the following describes the construction of a receiving loop antenna?

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E2C13

7. What indicator is required to be used by U.S.-licensed operators when operating a station via remote control where the transmitter is located in the U.S.?

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E6D09

8. What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?

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E6C07

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

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E7H15

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

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E4D02

11. Which of the following describes two problems caused by poor dynamic range in a communications receiver?

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Figure

E9B16

12. How many elevation lobes appear in the forward direction of the antenna radiation pattern shown in Figure E9-2?

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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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E3B03

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

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E9A05

15. What is included in the total resistance of an antenna system?

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E5B03

16. What happens to the phase angle of a reactance when it is converted to a susceptance?

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E3C15

17. What might a sudden rise in radio background noise indicate?

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E7D11

18. What circuit element is controlled by a series analog voltage regulator to maintain a constant output voltage?

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E9D10

19. What happens to feed point impedance at the base of a fixed length HF mobile antenna as the frequency of operation is lowered?

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E4C01

20. What is an effect of excessive phase noise in the local oscillator section of a receiver?

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E8B10

21. What describes frequency division multiplexing?

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E9F01

22. What is the velocity factor of a transmission line?

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E0A07

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

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E7A07

24. What logical operation does a NAND gate perform?

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Figure

E9G06

25. On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

E1A01

26. When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the highest frequency at which a properly adjusted USB emission will be totally within the band?

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E4A10

27. Which of the following displays multiple digital signal states simultaneously?

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E5D12

28. How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-VAC at 4 amperes?

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E9C01

29. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

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Figure

E6A11

30. In Figure E6-2, what is the schematic symbol for a P-channel junction FET?

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E6F06

31. Which of these materials is affected the most by photoconductivity?

E1D09

32. Which UHF amateur service bands have frequencies available for a space station?

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E7E02

33. What is the function of a reactance modulator?

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E7C01

34. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

E1E04

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

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E8C04

36. What technique is used to minimize the bandwidth requirements of a PSK31 signal?

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E6B13

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

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E3A05

38. Tropospheric propagation of microwave signals often occurs along what weather related structure?

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E4B08

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

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E2E01

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

E1B04

41. 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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E4E11

42. 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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E5A06

43. What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

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E7F05

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

E1F11

45. Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification?

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E2B01

46. How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?

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E7B01

47. For what portion of a signal cycle does a Class AB amplifier operate?

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E9E03

48. What is the name of the matching system that uses a section of transmission line connected in parallel with the feed line at or near the feed point?

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E5C13

49. What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?

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E2A11

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