Practice Exam

Element 4: Extra (EXPIRED)

E1C07

1. What is meant by local control?

E1F01

2. On what frequencies are spread spectrum transmissions permitted?

E7D02

3. What is one characteristic of a switching electronic voltage regulator?

E1B02

4. Which of the following factors might cause the physical location of an amateur station apparatus or antenna structure to be restricted?

E4E05

5. How can noise from an electric motor be suppressed?

E3A04

6. What type of receiving system is desirable for EME communications?

E6C13

7. Which of the following is an advantage of BiCMOS logic?

E8A13

8. What is an advantage of using digital signals instead of analog signals to convey the same information?

E2B09

9. What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?

E7G14

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

E9A04

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

E2A06

12. On what band would a satellite receive signals if it were operating in mode U/V?

E7C14

13. Which of these modes is most affected by non-linear phase response in a receiver IF filter?

E1D08

14. Which VHF amateur service bands have frequencies available for space stations?

E4D03

15. How can intermodulation interference between two repeaters occur?

E8B01

16. 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?

Figure

E9C08

17. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

E4B03

18. If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

E7A06

19. What is a characteristic of a monostable multivibrator?

E8C07

20. What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission?

E6E05

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

E7H04

22. How is positive feedback supplied in a Colpitts oscillator?

E5A06

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

Figure

E5C20

24. Which point in Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and an 18 microhenry inductor at 3.505 MHz?

E7B09

25. Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a pi-network output circuit?

E0A10

26. What material found in some electronic components such as high-voltage capacitors and transformers is considered toxic?

E3B03

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

E9E05

28. How must the driven element in a 3-element Yagi be tuned to use a hairpin matching system?

E4A07

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

E8D08

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

E7F01

31. What is the purpose of a prescaler circuit?

E2E09

32. Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?

E6D04

33. What function does a charge-coupled device (CCD) serve in a modern video camera?

E9D11

34. What is the function of a loading coil as used with an HF mobile antenna?

E6F05

35. Which of the following describes an optical shaft encoder?

Figure

E6A11

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

E9F11

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

E4C05

38. What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?

E1A03

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

E3C09

40. Which of the following is usually responsible for causing VHF signals to propagate for hundreds of miles?

E2D10

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

E9G04

42. What are the two families of circles and arcs that make up a Smith chart?

E5B11

43. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

E7E06

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

E9H03

45. What is the effective isotropic 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?

E2C02

46. Which of the following best describes the term "self-spotting" in regards to contest operating?

E6B04

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

E1E08

48. To which of the following examinees may a VE not administer an examination?

E5D01

49. What is the result of skin effect?

E9B10

50. What is the principle of a Method of Moments analysis?