Practice Exam

Element 4: Extra

E3C01

1. What does the radio communication term "ray tracing" describe?

E7E10

2. How does a diode envelope detector function?

E2E09

3. Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?

E1E06

4. Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?

E4B04

5. Which S parameter represents input port return loss or reflection coefficient (equivalent to VSWR)?

E3B05

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

E6F04

7. What is the photovoltaic effect?

E2C10

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

E8A08

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

E9B09

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

E9G01

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

E8C03

12. Why should phase-shifting of a PSK signal be done at the zero crossing of the RF signal?

E9E06

13. Which of these feed line impedances would be suitable for constructing a quarter-wave Q-section for matching a 100-ohm loop to 50-ohm feed line?

E7C02

14. Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?

E8D04

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

E7F10

16. What aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a Direct Digital Conversion SDR?

E6D05

17. What is one reason for using ferrite cores rather than powdered iron in an inductor?

E1D10

18. 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)?

E1C09

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

E7B03

20. Which of the following components form the output of a class D amplifier circuit?

E4D04

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

E5C01

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

E6B01

23. What is the most useful characteristic of a Zener diode?

E1F07

24. When may an amateur station send a message to a business?

E9A06

25. What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?

E7A06

26. What is a characteristic of a monostable multivibrator?

E3A12

27. What is the cause of auroral activity?

E4A09

28. Which of the following is good practice when using an oscilloscope probe?

E6A03

29. Why does a PN-junction diode not conduct current when reverse biased?

E7G02

30. What is ringing in a filter?

E8B03

31. What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency when the modulating frequency is 1000 Hz?

E4C09

32. Which of the following choices is a good reason for selecting a high frequency for the design of the IF in a superheterodyne HF or VHF communications receiver?

E9D06

33. What happens to the SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?

E9H10

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

E1B07

35. To what type of regulations does PRB-1 apply?

E7H13

36. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?

E7D10

37. 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?

E5B10

38. What is the relationship between the AC current through an inductor and the voltage across an inductor?

E9C05

39. Which of the following is a type of OCFD antenna?

E2B07

40. What is the name of the signal component that carries color information in NTSC video?

E4E06

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

E0A04

42. When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

E9F06

43. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?

E6C05

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

E5D02

45. Why is it important to keep lead lengths short for components used in circuits for VHF and above?

E6E06

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

E2D08

47. What type of packet frame is used to transmit APRS beacon data?

E2A09

48. What do the terms "L band" and "S band" specify regarding satellite communications?

E5A10

49. How is the Q of an RLC series resonant circuit calculated?

E1A07

50. What is the maximum power permitted on the 2200 meter band?