Practice Exam

Element 4: Extra

E2D06

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

E8C09

2. Which digital code allows only one bit to change between sequential code values?

E2B01

3. How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?

E5B02

4. What letter is commonly used to represent susceptance?

E1B02

5. Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?

E8A08

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

E8B08

7. What describes Orthogonal Frequency Division Multiplexing?

E9C09

8. Which of the following describes a G5RV antenna?

E4C06

9. A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?

E3B05

10. Which amateur bands typically support long-path propagation?

E4A05

11. What is the purpose of the prescaler function on a frequency counter?

E2E08

12. Which of the following HF digital modes can be used to transfer binary files?

E9B07

13. How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from a theoretical isotropic antenna, assuming each is driven by the same amount of power?

E3A02

14. What characterizes libration fading of an EME signal?

E6D11

15. Which type of core material decreases inductance when inserted into a coil?

E4E01

16. What problem can occur when using an automatic notch filter (ANF) to remove interfering carriers while receiving CW signals?

E2C11

17. How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?

E6F07

18. What is a solid-state relay?

E5A16

19. What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries and C is 10 picofarads?

E7E02

20. What is the function of a reactance modulator?

E7G01

21. What is the typical output impedance of an op-amp?

E1A05

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

E1D02

23. Which of the following may transmit special codes intended to obscure the meaning of messages?

E7H06

24. Which of the following oscillator circuits are commonly used in VFOs?

E9E08

25. What is a use for a Wilkinson divider?

E6A02

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

Figure

E9G07

27. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

E3C03

28. Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?

E9A05

29. What is included in the total resistance of an antenna system?

E6C01

30. What is the function of hysteresis in a comparator?

E9F09

31. What is the approximate physical length of a foam polyethylene dielectric coaxial transmission line that is electrically 1/4 wavelength long at 7.2 MHz?

E7F05

32. How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?

E9D08

33. What happens as the Q of an antenna increases?

E6B04

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

E7A05

35. Which of the following is a circuit that continuously alternates between two states without an external clock?

E8D04

36. What is the primary effect of extremely short rise or fall time on a CW signal?

E7B14

37. Why are switching amplifiers more efficient than linear amplifiers?

E4B08

38. Which of the following can be used to measure the Q of a series-tuned circuit?

E6E09

39. Which of the following component package types would be most suitable for use at frequencies above the HF range?

E1E02

40. Who does Part 97 task with maintaining the pools of questions for all U.S. amateur license examinations?

E5D14

41. What is reactive power?

E0A09

42. 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?

E1F02

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

E4D01

44. What is meant by the blocking dynamic range of a receiver?

E5C05

45. What is the name of the diagram used to show the phase relationship between impedances at a given frequency?

E7C01

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

E9H11

47. What feature of a cardioid pattern antenna makes it useful for direction finding?

Figure

E7D07

48. What is the purpose of C2 in the circuit shown in Figure E7-2?

E1C01

49. What is the maximum bandwidth for a data emission on 60 meters?

E2A03

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