Extra's Course Practice Test #5

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Extra Class Written Examination - Element 4

To pass this exam you must correctly answer 37 of the 50 questions

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1. How many watts are consumed in a circuit consisting of a 100-ohm resistor in series with a 100-ohm inductive reactance drawing 1 ampere? *

1 point

2. How does the modulation index of a phase-modulated emission vary with RF carrier frequency? *

1 point

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

1 point

4. Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz? *

1 point

5. Which is the most common input and output impedance of circuits that use MMICs? *

1 point

6. What is digital time division multiplexing? *

1 point

7. Which of these digital modes does not support keyboard-to-keyboard operation? *

1 point

8. Which of the following frequencies are sometimes used for amateur radio mesh networks? *

1 point

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

1 point

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

1 point

11. What happens to reactive power in an AC circuit that has both ideal inductors and ideal capacitors? *

1 point

12. How can an RF power amplifier be neutralized? *

1 point

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

1 point

14. How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz? *

1 point

15. What is the Cabrillo format? *

1 point

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

1 point

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

1 point

18. Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies? *

1 point

19. What is digital time division multiplexing? *

1 point

20. What logical operation does an OR gate perform? *

1 point

21. What is antenna efficiency? *

1 point

22. What might be indicated by a sudden rise in radio background noise across a large portion of the HF spectrum? *

1 point

23. Why are there separate electric (E) and magnetic (H) field MPE limits? *

1 point

24. Which of the following describes a G5RV antenna? *

1 point

25. What usually occurs if a Yagi antenna is designed solely for maximum forward gain? *

1 point

26. What is the primary function of an external earth connection or ground rod? *

1 point

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

1 point

28. Which of the following indicates that a silicon NPN junction transistor is biased on? *

1 point

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

1 point

30. What is the result of increasing the Q of an impedance-matching circuit? *

1 point

31. At what time of day can sporadic E propagation occur? *

1 point

32. What type of computer program technique is commonly used for modeling antennas? *

1 point

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

1 point

34. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms? *

1 point

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

1 point

36. What is antenna bandwidth? *

1 point

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

1 point

38. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118? *

1 point

39. What is the most common data rate used for HF packet? *

1 point

40. What is the purpose of the series capacitor in a gamma-type antenna matching network? *

1 point

41. Which of the following indicates that a silicon NPN junction transistor is biased on? *

1 point

42. Which of these functions can be performed by a phase-locked loop? *

1 point

43. What is susceptance? *

1 point

44. What undesirable effect can occur when using an IF noise blanker? *

1 point

45. What transmit frequency might generate an image response signal in a receiver tuned to 14.300 MHz and that uses a 455 kHz IF frequency? *

1 point

46. 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? *

1 point

47. Which of the following is a measure of the quality of an analog-to-digital converter? *

1 point

48. What characteristics of the MMIC make it a popular choice for VHF through microwave circuits? *

1 point

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

1 point

50. Except in some parts of Alaska, what is the maximum power permitted on the 630 meter
band? *

1 point

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