Practice Exam

Element 4: Extra

E9F07

1. How does parallel conductor transmission line compare to coaxial cable with a plastic dielectric?

E7F01

2. What is meant by "direct sampling" in software defined radios?

E1A04

3. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?

E2A02

4. Which of the following is characteristic of an inverting linear transponder?

E1B09

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

E1E06

6. Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?

E6C01

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

E2B11

8. What is the function of the vertical interval signaling (VIS) code sent as part of an SSTV transmission?

E5B01

9. What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage or to discharge to 36.8% of its initial voltage?

E9C06

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

E5A01

11. What can cause the voltage across reactances in a series RLC circuit to be higher than the voltage applied to the entire circuit?

E6E02

12. Which of the following device packages is a through-hole type?

E7B03

13. What circuit is required at the output of an RF switching amplifier?

E8C07

14. What is the bandwidth of a 4,800-Hz frequency shift, 9,600-baud ASCII FM transmission?

E9H07

15. What is the function of a Beverage antenna's termination resistor?

E2E01

16. Which of the following types of modulation is used for data emissions below 30 MHz?

E9G09

17. What third family of circles is often added to a Smith chart during the process of designing impedance matching networks?

E3C02

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

E4D13

19. What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?

E6F02

20. What happens to photoconductive material when light shines on it?

E4A11

21. Which of the following can be measured with an antenna analyzer?

E1C04

22. What is an IARP?

E9A10

23. Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

E4C12

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

E5C02

25. How are impedances described in polar coordinates?

E5D08

26. What is the primary cause of loss in film capacitors at RF?

E8D02

27. What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF carrier?

E2C04

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

E6A01

29. In what application is gallium arsenide used as a semiconductor material?

E6B05

30. What characteristic of a PIN diode makes it useful as an RF switch?

E8A10

31. What is the purpose of a low-pass filter used at the output of a digital-to-analog converter?

E3B11

32. At what time of day is sporadic-E propagation most likely to occur?

E9D07

33. What is an advantage of top loading an electrically short HF vertical antenna?

E3A10

34. What determines the speed of electromagnetic waves through a medium?

E4B10

35. Which of the following methods measures intermodulation distortion in an SSB transmitter?

E6D03

36. Which of the following is an aspect of the piezoelectric effect?

E8B08

37. What describes orthogonal frequency-division multiplexing (OFDM)?

E7E06

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

E1D12

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

E9E11

40. What is the purpose of using multiple driven elements connected through phasing lines?

E7A09

41. What logical operation is performed by a two-input exclusive NOR gate?

E1F11

42. 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?

Figure

E7G02

43. What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

E7D02

44. How does a switchmode voltage regulator work?

E9B07

45. What is the difference in radiated power between a lossless antenna with gain and an isotropic radiator driven by the same power?

E7H03

46. What is a phase-locked loop?

E2D01

47. Which of the following digital modes is designed for meteor scatter communications?

E4E03

48. Which of the following types of noise are removed by a noise blanker?

E7C02

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

E0A12

50. Where should a shock-absorbing lanyard be attached to a tower when working above ground?