Electronics & Radio Theory Quiz - Competitive Exams Ham_Radio_Technician

Free practice quiz: Electronics & Radio Theory (Competitive Exams Ham_Radio_Technician). 252 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Competitive Exams Ham_Radio_Technician practice quiz has 252 multiple-choice questions on Electronics & Radio Theory. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?

   1. The signal path encounters different concentrations of water vapor
   2. VHF ionospheric propagation is very sensitive to path length
   3. Multipath propagation cancels or reinforces signals
   4. The Doppler effect causes slight frequency shifts which result in changes in signal strength
   Show answer

   Answer: C. Multipath propagation cancels or reinforces signals

2. What does an FM signal sound like when received slightly off frequency?

   1. The audio increases in pitch
   2. The audio decrease in pitch
   3. There is no effect except for reduction in amplitude
   4. The audio becomes distorted
   Show answer

   Answer: D. The audio becomes distorted

3. What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

   1. 9600 amperes
   2. 200 amperes
   3. 0.667 amperes
   4. 1.5 amperes
   Show answer

   Answer: D. 1.5 amperes

4. What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?

   1. Set the receive and transmit frequency
   2. Provide automatic frequency control
   3. Inject a variable frequency to allow CW reception
   4. Generate and demodulate single sideband signals
   Show answer

   Answer: A. Set the receive and transmit frequency

5. What does it mean if a satellite is operating in U/V mode?

   1. The satellite uplink is in the 15-meter band and the downlink is in the 10-meter band
   2. The satellite uplink is in the 70-centimeter band and the downlink is in the 2-meter band
   3. The satellite operates using ultraviolet frequencies
   4. The satellite frequencies are usually variable
   Show answer

   Answer: B. The satellite uplink is in the 70-centimeter band and the downlink is in the 2-meter band

More questions in this quiz

Answers and explanations are in the full quiz.

1. How does vegetation affect UHF and microwave signals?
2. What antenna polarization is normally used for long-distance CW and SSB contacts on the VHF and UHF bands?
3. What is the effect of antenna cross-polarization over a line-of-sight VHF or UHF path?
4. When using a directional antenna, how might your station be able to communicate with a distant repeater if buildings or obstructions are blocking the direct line of sight path?
5. What is the meaning of the term "picket fencing"?
6. What weather condition might decrease range at microwave frequencies?
7. What is a likely cause of irregular fading of signals propagated by the ionosphere?
8. Which of the following results from the fact that signals propagated by the ionosphere are elliptically polarized?
9. What effect does multi-path propagation have on data transmissions?
10. Which region of the atmosphere can reflect HF radio waves?
11. What effect does fog or rain have on 10-meter and 6-meter band signals?
12. What is the relationship between the electric and magnetic fields of an electromagnetic wave?
13. What property of a radio wave defines its polarization?
14. What are the two components of a radio wave?
15. What is the velocity of a radio wave traveling through free space?
16. What is the relationship between wavelength and frequency?
17. What is the formula for converting frequency to approximate wavelength in meters?
18. In addition to frequency, which of the following is used to identify amateur radio bands?
19. What frequency range is referred to as VHF?
20. What frequency range is referred to as UHF?
21. What frequency range is referred to as HF?
22. What is the approximate velocity of a radio wave in free space?
23. Which of these frequencies travels at the highest velocity in free space?
24. Why are simplex UHF signals rarely heard beyond their radio horizon?
25. What is a characteristic of HF communication compared with communications on VHF and higher frequencies?
26. What is one characteristic of VHF signals received via auroral backscatter?
27. Which of the following types of propagation is most commonly associated with occasional strong signals on the 10-, 6-, and 2-meter bands from beyond the radio horizon?
28. Which of the following effects may allow radio signals to travel beyond obstructions between the transmitting and receiving stations?
29. What type of propagation is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?
30. What band is best suited for communicating via meteor scatter?
31. What causes tropospheric ducting?
32. What is generally the best time for long-distance 10-meter band propagation via the F region?
33. Which of the following bands may provide long-distance communications via the ionosphere's F region during the peak of the sunspot cycle?
34. Why is the radio horizon for VHF and UHF signals more distant than the visual horizon?
35. Which of the following is an appropriate power supply rating for a typical 50-watt output mobile FM transceiver?
36. Which of the following should be considered when selecting an accessory SWR meter?
37. Why are short, heavy-gauge wires used for a transceiver's DC power connection?
38. How are the audio input and output of a transceiver connected in a station configured to operate using FT8?
39. Where should an RF power meter be installed?
40. What signals are used in a computer-radio interface for digital mode operation?
41. Which of the following is one of the connections required between a computer and a transceiver to operate digital modes?
42. Which of the following conductors is preferred for bonding at RF?
43. How can you determine the length of time that equipment can be powered from a battery?
44. What function does a digital mode hotspot perform for nearby transceivers?
45. Where should the negative power return of a mobile transceiver be connected in a vehicle?
46. What is an electronic keyer?
47. What is the effect of excessive microphone gain on SSB transmissions?
48. Which of the following can be used to enter a transceiver's operating frequency?
49. How is squelch adjusted so that a weak FM signal can be heard?
50. What does the scanning function of an FM transceiver do?
51. Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?
52. What is a DMR "code plug"?
53. What is the advantage of having a choice of receiver filter bandwidths in a multimode transceiver?
54. How is a specific group of stations selected on a DMR digital voice transceiver?
55. Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception?
56. Which of the following must be programmed into a D-STAR digital transceiver before transmitting?
57. Electrical current is measured in which of the following units?
58. Electrical power is measured in which of the following units?
59. What is the term for the flow of electrons in an electric circuit?
60. What term describes the number of times per second that an alternating current makes a complete cycle?

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