Practice Exam

Element 4: Extra

Study material for this question can be found in the following resources:

E4C12

1. What is an undesirable effect of using too wide a filter bandwidth in the IF section of a receiver?

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E6D12

2. What is the definition of saturation in a ferrite core inductor?

E1A05

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

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E5B11

4. 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 50 ohms?

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E7B15

5. What is one way to prevent thermal runaway in a bipolar transistor amplifier?

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E9D09

6. What is the function of a loading coil used as part of an HF mobile antenna?

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E6B13

7. What type of bias is required for an LED to emit light?

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Figure

E6C08

8. In Figure E6-5, what is the schematic symbol for a NAND gate?

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E5C04

9. Which of the following represents a capacitive reactance in polar coordinates?

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E7D14

10. What is one purpose of a "bleeder" resistor in a conventional unregulated power supply?

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E9H01

11. When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

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E9F13

12. What impedance does a 1/4 wavelength transmission line present to a generator when the line is shorted at the far end?

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E8B06

13. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?

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E9A09

14. How is antenna efficiency calculated?

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Figure

E7G11

15. What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?

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E2A03

16. What is the orbital period of an Earth satellite?

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E3C02

17. What is indicated by a rising A or K index?

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E0A08

18. What does SAR measure?

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E9E07

19. What term best describes the interactions at the load end of a mismatched transmission line?

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E7C04

20. How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

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E4B16

21. Which S parameter represents return loss or SWR?

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E2D14

22. What is one advantage of using JT65 coding?

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E7F11

23. What sets the minimum detectable signal level for an SDR in the absence of atmospheric or thermal noise?

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E8A01

24. What is the name of the process that shows that a square wave is made up of a sine wave plus all of its odd harmonics?

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E2B09

25. What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?

E1F12

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

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E7A10

27. What is a truth table?

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E8C11

28. What is the relationship between symbol rate and baud?

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E6A03

29. Why does a PN-junction diode not conduct current when reverse biased?

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E3B14

30. What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?

E1C09

31. Which of these ranges of frequencies is available for an automatically controlled repeater operating below 30 MHz?

E1B03

32. Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?

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E4D09

33. What is the purpose of the preselector in a communications receiver?

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E8D10

34. What are some of the differences between the Baudot digital code and ASCII?

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E2C02

35. Which of the following best describes the term self-spotting in regards to HF contest operating?

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E6E09

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

E1D09

37. Which UHF amateur service bands have frequencies available for a space station?

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E2E07

38. What is the typical bandwidth of a properly modulated MFSK16 signal?

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E3A06

39. Which of the following is required for microwave propagation via rain scatter?

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E4A05

40. What might be an advantage of a digital vs an analog oscilloscope?

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E9C13

41. What is the main effect of placing a vertical antenna over an imperfect ground?

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E9G08

42. What is the process of normalization with regard to a Smith chart?

E1E13

43. Which of these choices is an acceptable method for monitoring the applicants if a VEC opts to conduct an exam session remotely?

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E5D07

44. What determines the strength of the magnetic field around a conductor?

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E7H07

45. How can an oscillator's microphonic responses be reduced?

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E4E06

46. What is a major cause of atmospheric static?

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E5A16

47. What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?

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E7E09

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

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E9B11

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

Study material for this question can be found in the following resources:

E6F10

50. What is the most common type of photovoltaic cell used for electrical power generation?