Practice Exam

Element 4: Extra

E4D11

1. Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?

E5D06

2. In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

E4B05

3. What three test loads are used to calibrate an RF vector network analyzer?

E1A01

4. Which of the following carrier frequencies is illegal for LSB AFSK emissions on the 17 meter band RTTY and data segment of 18.068 to 18.110 MHz?

E9C07

5. What is the approximate feed point impedance at the center of a two-wire folded dipole antenna?

E6D08

6. What is one reason for using powdered-iron cores rather than ferrite cores in an inductor?

E9D01

7. How much does the gain of an ideal parabolic dish antenna change when the operating frequency is doubled?

E9H07

8. Why is RF attenuation used when direction-finding?

E6B04

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

Figure

E9G06

10. On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

E7A08

11. What logical operation does an OR gate perform?

E6A07

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

E5A07

13. What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

E5B04

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

E1F02

15. What privileges are authorized in the U.S. to persons holding an amateur service license granted by the government of Canada?

E4A01

16. Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?

E6F09

17. What is the efficiency of a photovoltaic cell?

E8D01

18. Why are received spread spectrum signals resistant to interference?

E6C06

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

E4E06

20. What is one type of electrical interference that might be caused by a nearby personal computer?

E3B09

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

E1B04

22. What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historic Places?

E1E03

23. What is a Volunteer Examiner Coordinator?

E2A12

24. What is the purpose of digital store-and-forward functions on an amateur radio satellite?

E5C06

25. What does the impedance 50-j25 represent?

E7F08

26. What is the function of decimation?

E2B02

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

E6E09

28. Which of the following component package types would be most suitable for use at frequencies above the HF range?

E7C01

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

E3A11

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

E0A08

31. What does SAR measure?

E8A07

32. What determines the PEP-to-average power ratio of a single-sideband phone signal?

E7E06

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

E9F09

34. What is the approximate physical length of a foam polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 7.2 MHz?

E1C05

35. When may an automatically controlled station originate third party communications?

E7G05

36. How can unwanted ringing and audio instability be prevented in an op-amp RC audio filter circuit?

E7H10

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

E8C02

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

E8B09

39. What is deviation ratio?

E4C13

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

E2C02

41. Which of the following best describes the term "self-spotting" in connection with HF contest operating?

E9A12

42. How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?

Figure

E9B04

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

E2E07

44. Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

E3C14

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

E2D11

46. Which of the following data are used by the APRS network to communicate station location?

E9E03

47. 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?

E7B18

48. What is a characteristic of a grounded-grid amplifier?

E7D12

49. What is the dropout voltage of an analog voltage regulator?

E1D03

50. What is a space telecommand station?