Practice Exam

Element 4: Extra

E7D11

1. What is the purpose of an inverter connected to a solar panel output?

E3A10

2. What determines the speed of electromagnetic waves through a medium?

E2E12

3. How do ALE stations establish contact?

E1E11

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

Figure

E5C11

5. Which point in Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and an 18-microhenry inductor at 3.505 MHz?

E9F06

6. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?

E4E05

7. What is used to suppress radio frequency interference from a line-driven AC motor?

E3B07

8. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation?

E1A03

9. What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?

E4C10

10. What is an advantage of having a variety of receiver bandwidths from which to select?

E9G11

11. In what units are the wavelength scales on a Smith chart calibrated?

E9D11

12. Why do most two-element Yagis with normal spacing have a reflector instead of a director?

E5B06

13. What is susceptance?

E6A08

14. What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

E7A06

15. What is a characteristic of a monostable multivibrator?

E1D07

16. Which of the following HF amateur bands include allocations for space stations?

E1C04

17. What is an IARP?

E9B07

18. What is the difference in radiated power between a lossless antenna with gain and an isotropic radiator driven by the same power?

E2C07

19. What is the Cabrillo format?

E4D06

20. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

E6E08

21. How is power supplied to the most common type of MMIC?

E4B04

22. Which S parameter represents input port return loss or reflection coefficient (equivalent to VSWR)?

E8A01

23. What technique shows that a square wave is made up of a sine wave and its odd harmonics?

E8D05

24. What is the most common method of reducing key clicks?

E9C11

25. How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus soil?

E6D03

26. Which of the following is an aspect of the piezoelectric effect?

E3C02

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

E7C11

28. Which of the following measures a filter's ability to reject signals in adjacent channels?

E2D10

29. What does the packet path WIDE3-1 designate?

E9H04

30. What is the purpose of placing an electrostatic shield around a small-loop direction-finding antenna?

E7E02

31. What is the function of a reactance modulator?

E8B01

32. What is the modulation index of an FM signal?

E7H04

33. How is positive feedback supplied in a Colpitts oscillator?

E7B05

34. What can be done to prevent unwanted oscillations in an RF power amplifier?

E2A12

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

Figure

E7G09

36. What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

E1B09

37. Which amateur stations may be operated under RACES rules?

E8C15

38. What technique do individual nodes use to form a mesh network?

E4A04

39. How is compensation of an oscilloscope probe performed?

E0A03

40. Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

E7F14

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

E2B02

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

E1F03

43. Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

E5D06

44. What parasitic characteristic creates an inductor's self-resonance?

E6B08

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

E9E01

46. Which matching system for Yagi antennas requires the driven element to be insulated from the boom?

E5A08

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

E6F10

48. What is the most common material used in power-generating photovoltaic cells?

E9A11

49. Which of the following determines ground losses for a ground-mounted vertical antenna operating on HF?

E6C03

50. What is tri-state logic?