Practice Exam

Element 4: Extra

E7H09

1. What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?

E9D04

2. Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?

E9G01

3. Which of the following can be calculated using a Smith chart?

E6B03

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

E6D07

5. What is current in the primary winding of a transformer called if no load is attached to the secondary?

E2D08

6. What type of packet frame is used to transmit APRS beacon data?

E4A10

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

E1A07

8. What is the maximum power permitted on the 2200 meter band?

E6E07

9. What type of transmission line is used for connections to MMICs?

E5A12

10. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118?

E7F03

11. What type of digital signal processing filter is used to generate an SSB signal?

E3A11

12. What is a typical range for tropospheric propagation of microwave signals?

E1E08

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

E8C02

14. What is the definition of symbol rate in a digital transmission?

E4E05

15. How can radio frequency interference from an AC motor be suppressed?

E6C03

16. What is tri-state logic?

E9H03

17. What is Receiving Directivity Factor (RDF)?

E0A01

18. What is the primary function of an external earth connection or ground rod?

E6F04

19. What is the photovoltaic effect?

E7B01

20. For what portion of the signal cycle does each active element in a push-pull Class AB amplifier conduct?

E9C03

21. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed in phase?

E2C05

22. What is the function of a DX QSL Manager?

Figure

E7G07

23. What magnitude of voltage gain can be expected from the circuit in Figure E7 3 when R1 is 10 ohms and RF is 470 ohms?

E9E04

24. What is the purpose of the series capacitor in a gamma-type antenna matching network?

E1B01

25. Which of the following constitutes a spurious emission?

E7A01

26. Which circuit is bistable?

E9B08

27. What is the far field of an antenna?

E4B11

28. Which of the following can be measured with a vector network analyzer?

E2A05

29. What do the letters in a satellite's mode designator specify?

E1F05

30. 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?

E3C04

31. What does the value of Bz (B sub Z) represent?

E8D04

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

E4C03

33. What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?

E3B01

34. What is transequatorial propagation?

E8A05

35. What of the following instruments would be the most accurate for measuring the RMS voltage of a complex waveform?

E4D04

36. Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?

E8B11

37. What is digital time division multiplexing?

E7C12

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

E1C09

39. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

E9A01

40. What is an isotropic antenna?

E1D10

41. Which amateur stations are eligible to be telecommand stations of space stations (subject to the privileges of the class of operator license held by the control operator of the station)?

E5B11

42. 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?

E5D10

43. How can the true power be determined in an AC circuit where the voltage and current are out of phase?

Figure

E7D07

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

E6A02

45. Which of the following semiconductor materials contains excess free electrons?

E2E10

46. Which of these digital modes has the narrowest bandwidth?

E9F01

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

Figure

E5C12

48. 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?

E2B08

49. What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70 cm band?

E7E10

50. How does a diode envelope detector function?