Practice Exam

Element 4: Extra

E6D12

1. How many turns will be required to produce a 5-microhenry inductor using a powdered-iron toroidal core that has an inductance index (A L) value of 40 microhenrys/100 turns?

E2D09

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

E9A02

3. How much gain does a 1/2-wavelength dipole in free space have compared to an isotropic antenna?

E4C05

4. What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?

E9H04

5. What term describes station output, including the transmitter, antenna and everything in between, when considering transmitter power and system gains and losses?

E1C08

6. What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?

E5D10

7. How can the true power be determined in an AC circuit where the voltage and current are out of phase?

E9G10

8. What do the arcs on a Smith chart represent?

E2B18

9. On which of the following frequencies is one likely to find FM ATV transmissions?

E6B04

10. What type of semiconductor device is designed for use as a voltage-controlled capacitor?

E7H14

11. What is a phase-locked loop circuit?

E9F04

12. What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?

E4E07

13. How can you determine if line noise interference is being generated within your home?

E3C05

14. Which of the following describes selective fading?

E7B21

15. Which of the following devices is generally best suited for UHF or microwave power amplifier applications?

Figure

E6A07

16. In Figure E6-1, what is the schematic symbol for a PNP transistor?

E7D15

17. What is the purpose of a "step-start" circuit in a high-voltage power supply?

Figure

E6C11

18. In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?

E2C06

19. During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?

E9B04

20. What may occur when a directional antenna is operated at different frequencies within the band for which it was designed?

E5B04

21. What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all in parallel?

E3A06

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

E0A02

23. When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

E3B11

24. Which of the following describes gray-line propagation?

E1E04

25. Which of the following best describes the Volunteer Examiner accreditation process?

E6E09

26. Which of the following must be done to insure that a crystal oscillator provides the frequency specified by the crystal manufacturer?

E6F04

27. What is the photovoltaic effect?

E7F07

28. What determines the accuracy of a frequency counter?

E1F11

29. Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification?

E7C13

30. What is one advantage of a Pi matching network over an L matching network consisting of a single inductor and a single capacitor?

E8B11

31. Which of the following describes frequency division multiplexing?

E5A15

32. What is the resonant frequency of a series RLC circuit if R is 56 ohms, L is 40 microhenrys and C is 200 picofarads?

E7A10

33. What is a truth table?

E1B12

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

E4B13

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

E1D11

36. Which amateur stations are eligible to operate as Earth stations?

Figure

E5C19

37. Which point on Figure E5-2 best represents that impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?

E4A10

38. Which of the following tests establishes that a silicon NPN junction transistor is biased on?

E2E07

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

E2A13

40. What type of satellite appears to stay in one position in the sky?

E7E11

41. Which of the following types of detector is well suited for demodulating SSB signals?

E7G12

42. What is an integrated circuit operational amplifier?

E8D12

43. What is the peak voltage of a sinusoidal waveform if an RMS-reading voltmeter reads 34 volts?

E9D13

44. What happens to feed point impedance at the base of a fixed-length HF mobile antenna as the frequency of operation is lowered?

E8A12

45. What type of information can be conveyed using digital waveforms?

E8C13

46. What is one advantage of using JT-65 coding?

E4D11

47. Why are third-order intermodulation products created within a receiver of particular interest compared to other products?

E1A05

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

Figure

E9C07

49. What type of antenna pattern over real ground is shown in Figure E9-2?

E9E09

50. Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?