Extra's Course Practice Test #2

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Extra Class Written Examination - Element 4

To pass this exam you must correctly answer 37 of the 50 questions

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1. How is the compensation of an oscilloscope probe typically adjusted? *

1 point

2. In Figure E7-1, what is the purpose of R3? *

1 point

3. Which of the following operating arrangements allows an FCC-licensed U.S. citizen to operate in many European countries, and alien amateurs from many European countries to operate in the U.S.? *

1 point

4. Which of the following is a common use for a Smith chart? *

1 point

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

1 point

6. What do Hepburn maps predict? *

1 point

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

1 point

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

1 point

9. What is the typical output impedance of an op-amp? *

1 point

10. What do the arcs on a Smith chart represent? *

1 point

11. 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? *

1 point

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

1 point

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

1 point

14. Why are short connections used at microwave frequencies? *

1 point

How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance? *

1 point

16. Which of the following signals might a receiver noise blanker be able to remove from desired signals? *

1 point

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

1 point

18. What is the significance of voltmeter sensitivity expressed in ohms per volt? *

1 point

19. How does the maximum range of ground-wave propagation change when the signal frequency is increased? *

1 point

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

1 point

21. What technique minimizes the bandwidth of a PSK31 signal? *

1 point

22. What is an isotropic antenna? *

1 point

23. What is the gain-bandwidth of an operational amplifier? *

1 point

24. 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? *

1 point

25. Which HF amateur bands have frequencies authorized for space stations? *

1 point

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

1 point

27. What is susceptance? *

1 point

28. How can intermodulation interference between two repeaters occur? *

1 point

29. What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength? *

1 point

30. Which of these functions can be performed by a phase-locked loop? *

1 point

31. What is used to control the attenuation of RF signals by a PIN diode? *

1 point

32. What is the primary purpose of phasing lines when used with an antenna having multiple driven elements? *

1 point

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

1 point

34. How can the output voltage of a multiple-turn receiving loop antenna be increased? *

1 point

35. How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system? *

1 point

36. How does a diode envelope detector function? *

1 point

37. What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 14.1 MHz? *

1 point

38. Which of the following must be done to ensure that a crystal oscillator provides the frequency specified by the crystal manufacturer? *

1 point

39. Which of the following is an advantage of a Finite Impulse Response (FIR) filter vs an Infinite Impulse Response (IIR) digital filter? *

1 point

40. What is considered an acceptable maximum IMD level for an idling PSK signal? *

1 point

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

1 point

42. Which type of atmospheric structure can create a path for microwave propagation? *

1 point

43. When may an amateur station send a message to a business? *

1 point

44. Which of the following is a circuit that continuously alternates between two states without an external clock? *

1 point

45. Which of the following is a Schottky barrier diode? *

1 point

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

1 point

47. Which of the following types of amateur station communications are prohibited? *

1 point

48. What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased? *

1 point

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

1 point

50. With your transceiver displaying the carrier frequency of phone signals, you hear a DX station calling CQ on 3.601 MHz LSB. Is it legal to return the call using lower sideband on the same frequency? *

1 point

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