Practice Exam

Element 4: Extra (Starts July 1)

E4A07

1. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

E9G09

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

E5B11

3. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

E4D07

4. Which of the following reduces the likelihood of receiver desensitization?

E9E07

5. What parameter describes the interactions at the load end of a mismatched transmission line?

E7B09

6. Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a Pi-network output circuit?

E6C05

7. What is an advantage of CMOS logic devices over TTL devices?

E9D10

8. What happens to feed-point impedance at the base of a fixed length HF mobile antenna when operated below its resonant frequency?

E6F06

9. Which of these materials is most commonly used to create photoconductive devices?

E2A03

10. How is the signal inverted by an inverting linear transponder?

E2D06

11. Which of the following describes a method of establishing EME contacts?

E8D08

12. What parameter evaluates distortion of an AFSK signal caused by excessive input audio levels?

E7F12

13. Which of the following is an advantage of a Finite Impulse Response (FIR) filter vs an Infinite Impulse Response (IIR) digital filter?

E5C06

14. What does the impedance 50-j25 represent?

E7A11

15. What type of logic defines "1" as a high voltage?

E1D10

16. Which amateur stations are eligible to be telecommand stations of space stations (subject to the privileges of the class of operator license held by the control operator of the station)?

E4B02

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

E6A02

18. Which of the following semiconductor materials contains excess free electrons?

E7E06

19. Why is de-emphasis commonly used in FM communications receivers?

E5A07

20. What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

E2E12

21. How do ALE stations establish contact?

E1A01

22. Which of the following carrier frequencies is illegal for LSB AFSK emissions on the 17 meter band RTTY and data segment of 18.068 to 18.110 MHz?

E0A09

23. Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?

E8C11

24. What is the relationship between symbol rate and baud?

E2B05

25. Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

E2C01

26. What indicator is required to be used by U.S.-licensed operators when operating a station via remote control and the remote transmitter is located in the U.S.?

E8A08

27. Why would a direct or flash conversion analog-to-digital converter be useful for a software defined radio?

E9F13

28. What impedance does a 1/4-wavelength transmission line present to a generator when the line is shorted at the far end?

E7G05

29. How can unwanted ringing and audio instability be prevented in an op-amp RC audio filter circuit?

E1B11

30. What does PRB-1 require of regulations affecting amateur radio?

E9A10

31. Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

E9H01

32. When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?

E6E08

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

E1E01

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

E4E06

35. What is one type of electrical interference that might be caused by a nearby personal computer?

Figure

E9B03

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

E5D04

37. Why are short connections used at microwave frequencies?

E8B10

38. What is frequency division multiplexing?

E9C09

39. Which of the following describes a G5RV antenna?

E3C09

40. How does the intensity of an X3 flare compare to that of an X2 flare?

E7H11

41. What are the major spectral impurity components of direct digital synthesizers?

E1C13

42. What notifications must be given before transmitting on the 630 meter or 2200 meter bands?

E3B10

43. Why is chordal hop propagation desirable?

E1F10

44. Who may be the control operator of an auxiliary station?

E6B05

45. What characteristic of a PIN diode makes it useful as an RF switch?

E7C11

46. Which of the following describes a receiving filter's ability to reject signals occupying an adjacent channel?

E4C04

47. What is the noise figure of a receiver?

E6D07

48. What is current in the primary winding of a transformer called if no load is attached to the secondary?

E3A12

49. What is the cause of auroral activity?

E7D10

50. What is the primary reason that a high-frequency switching type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?