Practice Exam

Element 4: Extra

E9D10

1. How does radiation resistance of a base-fed whip antenna change below its resonant frequency?

E7B08

2. Why are switching amplifiers more efficient than linear amplifiers?

E2D11

3. How do APRS stations relay data?

E7H10

4. What information is contained in the lookup table of a direct digital synthesizer (DDS)?

E2E09

5. Which of the following HF digital modes uses variable-length character coding?

E2B02

6. How many horizontal lines make up a fast-scan (NTSC) television frame?

E7C07

7. Which describes a Pi-L network?

E9A10

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

E8C07

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

E9G09

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

E9E11

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

E1B08

12. What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?

E1D10

13. 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?

E9C02

14. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4- wavelength apart and fed 90 degrees out of phase?

E4D08

15. What causes intermodulation in an electronic circuit?

E2C12

16. What indicates the delay between a control operator action and the corresponding change in the transmitted signal?

E6C06

17. Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

E3C08

18. Which of the following is the space-weather term for an extreme geomagnetic storm?

E6B08

19. Which of the following is a Schottky barrier diode?

E3A05

20. How are the component fields of an electromagnetic wave oriented?

E7A09

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

E4E13

22. Where should a station AC surge protector be installed?

E5A13

23. What is an effect of increasing Q in a series resonant circuit?

E1F09

24. Which of the following cannot be transmitted over an amateur radio mesh network?

E5B11

25. 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?

Figure

E6A10

26. In Figure E6-1, which is the schematic symbol for an N-channel dual-gate MOSFET?

E4C08

27. An SDR receiver is overloaded when input signals exceed what level?

E4B07

28. What do the subscripts of S parameters represent?

E9H05

29. What challenge is presented by a small wire-loop antenna for direction finding?

E7E07

30. What is meant by the term "baseband" in radio communications?

E5D02

31. Why is it important to keep lead lengths short for components used in circuits for VHF and above?

E6D10

32. What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

E7D11

33. What is the purpose of an inverter connected to a solar panel output?

E8D05

34. What is the most common method of reducing key clicks?

Figure

E9B04

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

E7F03

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

E3B13

37. What type of polarization is supported by ground-wave propagation?

E0A11

38. To what should lanyards be attached while climbing?

E6F02

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

E8A03

40. Which of the following describes a signal in the time domain?

E2A07

41. Which of the following types of signals can be relayed through a linear transponder?

E6E11

42. What is a characteristic of DIP packaging used for integrated circuits?

E1C07

43. What notifications must be given before transmitting on the 630- or 2200-meter bands?

E1E11

44. What must the VE team do if an examinee scores a passing grade on all examination elements needed for an upgrade or new license?

E4A06

45. What is the effect of aliasing on a digital oscilloscope when displaying a waveform?

E9F11

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

E5C01

47. Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?

E7G03

48. What is the typical input impedance of an op-amp?

E1A07

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

E8B05

50. What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 5 kHz if the highest modulation frequency is 3 kHz?