Practice Exam

Element 4: Extra

E9H08

1. What is the function of a sense antenna?

E7F08

2. What is the function of decimation?

E3C09

3. How does the intensity of an X3 flare compare to that of an X2 flare?

E1F06

4. Under what circumstances might the FCC issue a Special Temporary Authority (STA) to an amateur station?

E6D04

5. Which materials are commonly used as a core in an inductor?

E5C08

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

E7C01

7. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

E6C06

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

E0A10

9. What toxic material may be present in some electronic components such as high voltage capacitors and transformers?

E7G03

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

E7E08

11. What are the principal frequencies that appear at the output of a mixer circuit?

E1C01

12. What is the maximum bandwidth for a data emission on 60 meters?

E7D09

13. What is the main reason to use a charge controller with a solar power system?

E4E10

14. What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

E9E02

15. What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?

Figure

E6B10

16. In Figure E6-2, what is the schematic symbol for a light-emitting diode?

E8D04

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

E9A06

18. What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?

E2A05

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

E9B10

20. What is the principle of a Method of Moments analysis?

E6A07

21. Which of the following indicates that a silicon NPN junction transistor is biased on?

E5B07

22. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?

E2D05

23. What is one advantage of the JT65 mode?

E5A02

24. What is resonance in an LC or RLC circuit?

E7B13

25. Which of the following describes an emitter follower (or common collector) amplifier?

E4C12

26. Which of the following has the largest effect on an SDR receiver's dynamic range?

E8B05

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

E6E11

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

E8C12

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

E3B12

30. What is the primary characteristic of chordal hop propagation?

E6F01

31. What absorbs the energy from light falling on a photovoltaic cell?

E3A07

32. Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

E4B07

33. What do the subscripts of S parameters represent?

E4A03

34. Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?

E1A03

35. What is the maximum legal carrier frequency on the 20 meter band for transmitting USB AFSK digital signals having a 1 kHz bandwidth?

E9G03

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

E5D09

37. What happens to reactive power in an AC circuit that has both ideal inductors and ideal capacitors?

E7H11

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

E2B07

39. What is the name of the signal component that carries color information in NTSC video?

E9F02

40. Which of the following has the biggest effect on the velocity factor of a transmission line?

E4D05

41. What transmitter frequencies would cause an intermodulation-product signal in a receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?

E1E11

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

E2E06

43. What is the most common data rate used for HF packet?

E1B05

44. What is the National Radio Quiet Zone?

E8A04

45. What is "dither" with respect to analog-to-digital converters?

E9C02

46. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/4-wavelength apart and fed 90 degrees out of phase?

E2C06

47. During a VHF/UHF contest, in which band segment would you expect to find the highest level of SSB or CW activity?

E9D06

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

E1D02

49. Which of the following may transmit special codes intended to obscure the meaning of messages?

E7A01

50. Which circuit is bistable?