Practice Exam

Element 4: Extra

E7D15

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

E5B02

2. What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial voltage?

E2C03

3. From which of the following bands is amateur radio contesting generally excluded?

E1A12

4. With your transceiver displaying the carrier frequency of CW signals, you hear a DX station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same frequency?

E5C09

5. When using rectangular coordinates to graph the impedance of a circuit, what does the horizontal axis represent?

E6D03

6. Which of the following is true of a charge-coupled device (CCD)?

E8B05

7. What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?

E6B09

8. What is a common use for point contact diodes?

E1C04

9. When may an automatically controlled station retransmit third party communications?

E4A10

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

E8A15

11. What would the waveform of a stream of digital data bits look like on a conventional oscilloscope?

E7H17

12. Why is a phase-locked loop often used as part of a variable frequency synthesizer for receivers and transmitters?

E3C04

13. Which emission mode is best for Aurora propagation?

Figure

E7B11

14. In Figure E7-1, what is the purpose of R3?

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?

E5A16

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

E5D16

17. What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current?

E4D06

18. What is the term for unwanted signals generated by the mixing of two or more signals?

E7A08

19. What logical operation does an OR gate perform?

E9A07

20. What is a folded dipole antenna?

E7F08

21. Which of the following is performed by a frequency counter?

E3A10

22. Which of the following is a good technique for making meteor-scatter contacts?

E9G01

23. Which of the following can be calculated using a Smith chart?

E2D03

24. Which of the following digital modes is especially useful for EME communications?

E9C06

25. What is the effect of a terminating resistor on a rhombic antenna?

E2B06

26. What is vestigial sideband modulation?

E1F13

27. What types of communications may be transmitted to amateur stations in foreign countries?

E1B09

28. Which amateur stations may be operated in RACES?

E9H10

29. How can the output voltage of a multi-turn receiving loop antenna be increased?

E2E07

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

E6A06

31. What is the beta of a bipolar junction transistor?

E9E13

32. What is the purpose of a Wilkinson divider?

E6F03

33. What is the most common configuration of an optoisolator or optocoupler?

E9D12

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

E1D05

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

E1E08

36. To which of the following examinees may a VE not administer an examination?

E6C05

37. Which of the following is an advantage of CMOS logic devices over TTL devices?

E4E04

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

E2A03

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

E6E09

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

E7C09

41. What type of digital signal processing filter might be used to generate an SSB signal?

E9B08

42. How can the approximate beamwidth in a given plane of a directional antenna be determined?

E9F03

43. Why is the physical length of a coaxial cable transmission line shorter than its electrical length?

E8C03

44. What is one advantage of using the ASCII code for data communications?

E7E03

45. How does an analog phase modulator function?

E4B12

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

E3B03

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

E4C08

48. How might lowering the noise figure affect receiver performance?

E8D09

49. What is meant by circularly polarized electromagnetic waves?

E0A07

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