Practice Exam

Element 4: Extra

E7H11

1. What are the major spectral impurity components of direct digital synthesizers?

E9B09

2. What type of computer program technique is commonly used for modeling antennas?

Figure

E6A11

3. In Figure E6-1, what is the schematic symbol for a P-channel junction FET?

E9F13

4. What impedance does a 1/4-wavelength transmission line present to a generator when the line is shorted at the far end?

E9E03

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

E3A03

6. When scheduling EME contacts, which of these conditions will generally result in the least path loss?

E7B17

7. Why are odd-order rather than even-order intermodulation distortion products of concern in linear power amplifiers?

E7F03

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

E6F09

9. What is the efficiency of a photovoltaic cell?

E9H01

10. When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

E8A11

11. Which of the following is a measure of the quality of an analog-to-digital converter?

E3C14

12. Why does the radio-path horizon distance exceed the geometric horizon?

E7C04

13. How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

E0A02

14. When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

E8D03

15. How does the spread spectrum technique of frequency hopping work?

E1D04

16. Which of the following is required in the identification transmissions from a balloon-borne telemetry station?

E4D09

17. What is the purpose of the preselector in a communications receiver?

E7E09

18. What occurs when an excessive amount of signal energy reaches a mixer circuit?

E4A02

19. Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?

E9A09

20. What is antenna efficiency?

E1F04

21. Which of the following geographic descriptions approximately describes "Line A"?

E4B01

22. Which of the following factors most affects the accuracy of a frequency counter?

E6D11

23. Which type of core material decreases inductance when inserted into a coil?

E2D04

24. What technology is used to track, in real time, balloons carrying amateur radio transmitters?

E3B09

25. At what time of year is sporadic E propagation most likely to occur?

E9G03

26. Which of the following is often determined using a Smith chart?

E1B01

27. Which of the following constitutes a spurious emission?

E5B04

28. What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all in parallel?

E2B11

29. What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission?

E9C06

30. What is the effect of adding a terminating resistor to a rhombic antenna?

E8B06

31. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?

E2C09

32. What type of equipment is commonly used to implement an amateur radio mesh network?

E1E02

33. Who does Part 97 task with maintaining the pools of questions for all U.S. amateur license examinations?

E5A12

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

E5C08

35. What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive and/or capacitive reactance?

E9D06

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

E6E10

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

E1A11

38. Which of the following describes authorization or licensing required when operating an amateur station aboard a U.S.-registered vessel in international waters?

E4C05

39. What does a receiver noise floor of -174 dBm represent?

E7A11

40. What type of logic defines "1" as a high voltage?

E7D03

41. What device is typically used as a stable voltage reference in a linear voltage regulator?

E5D15

42. What is the power factor of an RL circuit having a 45-degree phase angle between the voltage and the current?

E6B04

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

E8C03

44. Why should phase-shifting of a PSK signal be done at the zero crossing of the RF signal?

E4E11

45. What could cause local AM broadcast band signals to combine to generate spurious signals in the MF or HF bands?

E2E01

46. Which of the following types of modulation is common for data emissions below 30 MHz?

E1C12

47. On what portion of the 630 meter band are phone emissions permitted?

E6C03

48. What is tri-state logic?

Figure

E7G11

49. What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3300 ohms and RF is 47 kilohms?

E2A11

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