Practice Exam

Element 4: Extra

E3A09

1. Which of the following frequency ranges is most suited for meteor-scatter communications?

E8C12

2. What factors affect the bandwidth of a transmitted CW signal?

E2E02

3. Which of the following synchronizes WSJT-X digital mode transmit/receive timing?

E2D03

4. Which of the following digital modes is designed for EME communications?

E0A04

5. When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

E9C06

6. What is the effect of adding a terminating resistor to a rhombic or long-wire antenna?

E1F11

7. 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?

E9F11

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

E7A03

9. Which of the following can divide the frequency of a pulse train by 2?

E3C03

10. Which of the following signal paths is most likely to experience high levels of absorption when the A-index or K-index is elevated?

Figure

E7B11

11. In Figure E7-1, what is the purpose of R3?

E9E09

12. Which of the following is used to shunt feed a grounded tower at its base?

E4D11

13. Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?

E3B02

14. What is the approximate maximum range for signals using transequatorial propagation?

E9A01

15. What is an isotropic radiator?

E1D12

16. Which of the following amateur stations may transmit one-way communications?

E8B01

17. What is the modulation index of an FM signal?

E9D06

18. What happens to SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?

E6E10

19. What advantage does surface-mount technology offer at RF compared to using through-hole components?

E5B11

20. 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 75 ohms?

E1C03

21. How long must an operator wait after filing a notification with the Utilities Technology Council (UTC) before operating on the 2200-meter or 630-meter band?

E6A08

22. What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

E8D04

23. What is the primary effect of extremely short rise or fall time on a CW signal?

E8A09

24. How many different input levels can be encoded by an analog-to-digital converter with 8-bit resolution?

E7F14

25. Which of the following would allow a digital signal processing filter to create a sharper filter response?

Figure

E7D07

26. What is the purpose of C2 in the circuit shown in Figure E7-2?

E4A08

27. Which of the following is used to measure SWR?

E9G02

28. What type of coordinate system is used in a Smith chart?

E2A11

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

E6B09

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

Figure

E9B04

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

E7G01

32. What is the typical output impedance of an op-amp?

E1E02

33. Who is tasked by Part 97 with maintaining the pools of questions for all US amateur license examinations?

E2B05

34. Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

E6D05

35. How do ferrite and powdered iron compare for use in an inductor core?

E6C04

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

E9H03

37. What is receiving directivity factor (RDF)?

E4C12

38. How does a narrow-band roofing filter affect receiver performance?

E5D05

39. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF?

E4B07

40. What do the subscripts of S parameters represent?

Figure

E5C12

41. Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?

E7H05

42. How is positive feedback supplied in a Pierce oscillator?

E5A11

43. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?

E1B07

44. To what type of regulations does PRB-1 apply?

E7C02

45. What is the frequency response of a T-network with series capacitors and a shunt inductor?

E7E05

46. What is added to an FM speech channel to boost the higher audio frequencies?

E1A02

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

E2C04

48. Which of the following frequencies can be used for amateur radio mesh networks?

E6F09

49. What is the efficiency of a photovoltaic cell?

E4E06

50. What type of electrical interference can be caused by computer network equipment?