Practice Exam

Element 4: Extra

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

E4D04

1. Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?

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E9A11

2. Which of the following factors determines ground losses for a ground-mounted vertical antenna operating in the 3 MHz to 30 MHz range?

E7H04

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

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E7A03

4. Which of the following can divide the frequency of a pulse train by 2?

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E2A01

5. What is the direction of an ascending pass for an amateur satellite?

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Figure

E9B03

6. In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?

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E3C07

7. Which of the following descriptors indicates the greatest solar flare intensity?

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E5D18

8. How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?

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Figure

E6B10

9. In Figure E6-3, what is the schematic symbol for a light-emitting diode?

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E6F02

10. What happens to the conductivity of a photoconductive material when light shines on it?

E1A05

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

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E9E09

12. 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?

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E4B15

13. Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?

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Figure

E7G11

14. 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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E8A05

15. What would be the most accurate way of measuring the RMS voltage of a complex waveform?

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E8B08

16. What describes Orthogonal Frequency Division Multiplexing?

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E7D09

17. What is the main reason to use a charge controller with a solar power system?

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E4E13

18. What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?

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E6C12

19. What is BiCMOS logic?

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E2D05

20. Which of the following techniques is normally used by low Earth orbiting digital satellites to relay messages around the world?

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E6E12

21. Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?

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E3A02

22. What characterizes libration fading of an EME signal?

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E9F06

23. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically one-half wavelength long at 14.10 MHz?

E1B07

24. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

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E2B08

25. Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?

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E0A07

26. How may dangerous levels of carbon monoxide from an emergency generator be detected?

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E6A08

27. What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

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E5C01

28. Which of the following represents a capacitive reactance in rectangular notation?

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E7E09

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

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E3B03

30. What is the best time of day for transequatorial propagation?

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E9G08

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

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E8D09

32. What is considered a good minimum IMD level for an idling PSK signal?

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E1C13

33. Which of the following is required in order to operate in accordance with CEPT rules in foreign countries where permitted?

E1E14

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

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E5B12

35. What is admittance?

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E4A06

36. What is the effect of aliasing in a digital or computer-based oscilloscope?

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E9H05

37. What is the main drawback of a wire-loop antenna for direction finding?

E1D06

38. Which of the following is a requirement of a space station?

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E2E13

39. Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?

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E9D02

40. How can linearly polarized Yagi antennas be used to produce circular polarization?

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E6D04

41. Which materials are commonly used as a slug core in a variable inductor?

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E7C01

42. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

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E5A16

43. 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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E2C10

44. Why might a DX station state that they are listening on another frequency?

E1F02

45. What privileges are authorized in the U.S. to persons holding an amateur service license granted by the Government of Canada?

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E9C14

46. 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?

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E4C08

47. An SDR receiver is overloaded when input signals exceed what level?

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Figure

E7B10

48. In Figure E7-1, what is the purpose of R1 and R2?

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E7F01

49. What is meant by direct digital conversion as applied to software defined radios?

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E8C03

50. When performing phase shift keying, why is it advantageous to shift phase precisely at the zero crossing of the RF carrier?