Practice Exam

Element 4: Extra (EXPIRED)

E2B02

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

E1C09

2. Which of these frequencies are available for an automatically controlled repeater operating below 30 MHz?

E6A04

3. What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?

E9H07

4. Why is it advisable to use an RF attenuator on a receiver being used for direction finding?

E9G09

5. What third family of circles is often added to a Smith chart during the process of solving problems?

E9E12

6. What is the primary purpose of a phasing line when used with an antenna having multiple driven elements?

E1D05

7. What class of licensee is authorized to be the control operator of a space station?

E9A15

8. What is meant by the radiation resistance of an antenna?

E1A08

9. If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

E7B02

10. What is a Class D amplifier?

E1F07

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

E8A07

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

E4C15

13. What is the primary source of noise that can be heard from an HF receiver with an antenna connected?

E4A02

14. Which of the following parameters would a spectrum analyzer display on the horizontal axis?

E6C12

15. What is BiCMOS logic?

E5D12

16. How many watts are consumed in a circuit having a power factor of 0.2 if the input is 100-V AC at 4 amperes?

E7E14

17. What is meant by direct conversion when referring to a software defined receiver?

E3C10

18. How does the performance of a horizontally polarized antenna mounted on the side of a hill compare with the same antenna mounted on flat ground?

E7A12

19. What is the name for logic which represents a logic "0" as a high voltage?

E2D09

20. Under clear communications conditions, which of these digital communications modes has the fastest data throughput?

E8D02

21. What is the relationship between the peak-to-peak voltage and the peak voltage amplitude of a symmetrical waveform?

E8B06

22. 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?

E4E04

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

E9F07

24. How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?

E6D08

25. What is one important reason for using powdered-iron toroids rather than ferrite toroids in an inductor?

E4B12

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

E5B08

27. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms?

E4D14

28. Which of the following is a way to reduce the likelihood of receiver desensitization?

E1E14

29. For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?

E6E06

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

E2E10

31. Which of these digital communications modes has the narrowest bandwidth?

E5A04

32. What is the magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance?

E8C12

33. What is the advantage of including a parity bit with an ASCII character stream?

E2A02

34. What is the direction of a descending pass for an amateur satellite?

E3A06

35. What frequency range would you normally tune to find EME signals in the 2 meter band?

E7C02

36. A T-network with series capacitors and a parallel shunt inductor has which of the following properties?

E7F07

37. What determines the accuracy of a frequency counter?

E7G05

38. How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?

E6B06

39. Which of the following is a common use of a hot-carrier diode?

E3B10

40. What is the cause of gray-line propagation?

E1B12

41. What is the highest modulation index permitted at the highest modulation frequency for angle modulation?

E5C13

42. What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of an impedance?

E7H07

43. What is a magnetron oscillator?

E9D12

44. What is one advantage of using a trapped antenna?

E6F04

45. What is the photovoltaic effect?

E2C09

46. How does the spread-spectrum technique of frequency hopping work?

E9C01

47. What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?

E9B13

48. What does the abbreviation NEC stand for when applied to antenna modeling programs?

E7D14

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

E0A05

50. What is one of the potential hazards of using microwaves in the amateur radio bands?