Practice Exam

Element 4: Extra (EXPIRED)

E9D01

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

E2E06

2. What is the most common data rate used for HF packet communications?

E4A09

3. Which of the following describes a good method for measuring the intermodulation distortion of your own PSK signal?

E1B12

4. What is the highest modulation index permitted at the highest modulation frequency for angle modulation?

E9H05

5. What is the main drawback of a wire-loop antenna for direction finding?

E3C07

6. How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?

E0A11

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

E7D17

8. What is the primary reason that a high-frequency inverter type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

E1E01

9. What is the minimum number of qualified VEs required to administer an Element 4 amateur operator license examination?

E6A05

10. What is the alpha of a bipolar junction transistor?

E5C13

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

E2B12

12. How are analog SSTV images typically transmitted on the HF bands?

E9E03

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

E4C15

14. What is the primary source of noise that can be heard from an HF receiver with an antenna connected?

E2D06

15. Which of the following is a commonly used 2-meter APRS frequency?

E4D07

16. Which of the following describes the most significant effect of an off-frequency signal when it is causing cross-modulation interference to a desired signal?

Figure

E9C09

17. What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?

E7B05

18. What can be done to prevent unwanted oscillations in an RF power amplifier?

E7A13

19. What is an SR or RS flip-flop?

E8B04

20. What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2-kHz modulating frequency?

E1A08

21. If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

E7C13

22. What is one advantage of a Pi matching network over an L matching network consisting of a single inductor and a single capacitor?

E5B05

23. How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?

E7G12

24. What is an integrated circuit operational amplifier?

E8A14

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

E6B06

26. Which of the following is a common use of a hot-carrier diode?

E6E03

27. What is one aspect of the piezoelectric effect?

E3A02

28. What characterizes libration fading of an Earth-Moon-Earth signal?

E2C07

29. What is the Cabrillo format?

E7F07

30. What determines the accuracy of a frequency counter?

E4E05

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

E6F02

32. What happens to the conductivity of a photoconductive material when light shines on it?

E9A10

33. How is antenna efficiency calculated?

E9G11

34. How are the wavelength scales on a Smith chart calibrated?

E4B02

35. What is an advantage of using a bridge circuit to measure impedance?

E1D11

36. Which amateur stations are eligible to operate as Earth stations?

E6C03

37. Which of the following describes tri-state logic?

E6D07

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

E9F04

39. What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

E7E06

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

E5A08

41. What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

E3B01

42. What is transequatorial propagation?

Figure

E9B02

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

E8C10

44. What spread-spectrum communications technique alters the center frequency of a conventional carrier many times per second in accordance with a pseudo-random list of channels?

E1C08

45. What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?

E7H08

46. What is a Gunn diode oscillator?

E1F05

47. 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?

E2A11

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

E8D09

49. What is meant by circularly polarized electromagnetic waves?

E5D12

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