Practice Exam

Element 4: Extra

E4C07

1. What does the MDS of a receiver represent?

E0A04

2. When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

E4D03

3. How can intermodulation interference between two repeaters occur?

E8C01

4. How is Forward Error Correction implemented?

E9C08

5. What is a folded dipole antenna?

E7A08

6. What logical operation does an OR gate perform?

E1D05

7. What must be posted at the station location of a station being operated by telecommand on or within 50 km of the earth's surface?

E6F07

8. What is a solid-state relay?

E7C06

9. What are the distinguishing features of an elliptical filter?

E4A07

10. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

E2E11

11. What is the difference between direct FSK and audio FSK?

E8B05

12. 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?

E1A05

13. What is the maximum power output permitted on the 60 meter band?

E6E06

14. What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?

E9A11

15. Which of the following factors determines ground losses for a ground-mounted vertical antenna operating in the 3 MHz to 30 MHz range?

E9F04

16. What impedance does a 1/2-wavelength transmission line present to a generator when the line is shorted at the far end?

E1E06

17. Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?

E9E01

18. What system matches a higher-impedance transmission line to a lower-impedance antenna by connecting the line to the driven element in two places spaced a fraction of a wavelength each side of element center?

E1F10

19. Who may be the control operator of an auxiliary station?

E9D04

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

E7D03

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

E2A05

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

E6C05

23. What is an advantage of CMOS logic devices over TTL devices?

E7B08

24. How can an RF power amplifier be neutralized?

E6D07

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

E2B01

26. How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?

E5A08

27. What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

E8D08

28. What parameter evaluates distortion of an AFSK signal caused by excessive input audio levels?

E3A07

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

E8A09

30. How many different input levels can be encoded by an analog-to-digital converter with 8-bit resolution?

E1C09

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

E2D05

32. What is one advantage of the JT65 mode?

E4E04

33. How can conducted and radiated noise caused by an automobile alternator be suppressed?

E5D12

34. How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100 VAC at 4 amperes?

E3C14

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

E5C03

36. Which of the following represents an inductive reactance in polar coordinates?

E6B05

37. What characteristic of a PIN diode makes it useful as an RF switch?

E7E02

38. What is the function of a reactance modulator?

E9G02

39. What type of coordinate system is used in a Smith chart?

E3B01

40. What is transequatorial propagation?

E4B08

41. Which of the following can be used to measure the Q of a series-tuned circuit?

E1B07

42. To what type of regulations does PRB-1 apply?

E5B12

43. What is admittance?

E6A02

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

E2C03

45. From which of the following bands is amateur radio contesting generally excluded?

E7F14

46. Which of the following would allow a digital signal processing filter to create a sharper filter response?

Figure

E7G11

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

E9H07

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

Figure

E9B06

49. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

E7H13

50. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?