This is the Multiple Choice Questions (MCQs) in Chapter 32: Wireless and Personal Communications Systems from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.
Begin the Test
1. A network that employs one powerful central computer and several PCs is called:
- A. A wireless network.
- B. A local-area network.
- C. A client-server network.
- D. A peer-to-peer network.
2. Infrared and optical wireless links work best:
- A. Over distances exceeding 1000 miles.
- B. On a line of sight.
- C. At low radio frequencies.
- D. In situations with high levels of noise.
3. Which of the following devices or systems is not generally considered wireless?
- A. A remote-control garage-door opener.
- B. An amateur radio station.
- C. A beeper/pager.
- D. A telephone set that requires a wall jack.
4. A noise blanker can improve the quality of:
- A. Radio reception.
- B. Radio transmission.
- C. Infrared reception.
- D. Infrared transmission.
5. In the United States, a license is required for:
- A. Receiving on amateur-radio frequencies.
- B. Transmitting on amateur-radio frequencies.
- C. Using infrared wireless devices.
- D. Using a wireless automobile security system.
6. Noise in a wireless receiver can be minimized by:
- A. Raising the temperature to very high values.
- B. Reducing the temperature to very low values.
- C. Maximizing the amplification.
- D. Minimizing the relative humidity.
7. As the data speed increases in a wireless system, all other factors being equal:
- A. The signal bandwidth increases.
- B. The signal bandwidth decreases.
- C. The overall noise level increases.
- D. The overall noise level decreases.
8. The term shortwave, in reference to radio, refers to signals having
wavelengths of approximately:
- A. 10 to 100 millimeters.
- B. 100 millimeters to 1 meter.
- C. 1 to 10 meters.
- D. 10 to 100 meters.
9. In general, as the noise level in a wireless system increases:
- A. Stronger incoming signals are needed to overcome it.
- B. Weaker signals can be received.
- C. The temperature of the system rises.
- D. The bandwidth of the system increases.
10. In a spectrum analyzer, the horizontal axis shows:
- A. Voltage.
- B. Power.
- C. Frequency.
- D. Time.
11. A device consisting of a receiver and transmitter in the same box is called a:
- A. Modem.
- B. Transverter.
- C. Transceiver.
- D. Transponder.
12. The use of direction-finding equipment to determine the latitude and longitude of a radio transmitter is an example of:
- A. Radiolocation.
- B. IR wireless.
- C. The Global Positioning System.
- D. Packet radio.
13. A LAN in which each user’s computer stores its own data is called:
- A. A wireless LAN.
- B. A wide-area LAN.
- C. LAN topology.
- D. A peer-to-peer LAN.
14. Which of the following constitutes illegal use of ham radio?
- A. Selling cars by broadcasting prices to other hams.
- B. Talking about the weather and exchanging local forecasts.
- C. Talking about who might be the next president of the United States.
- D. Connecting a radio to the Internet.
15. An electromagnetic wave can be considered to fall in the shortwave band if its free-space wavelength is:
- A. 55 kilometers.
- B. 55 meters.
- C. 55 centimeters.
- D. 55 millimeters.
16. In a cellular network, a base station is sometimes called a:
- A. Transceiver.
- B. Cell.
- C. Repeater.
- D. Cell phone.
17. An advantage of conventional hard-wired telephone over cellular is:
- A. Privacy.
- B. Portability.
- C. Ease of use in a car.
- D. LAN topology.
18. An advantage of cellular over conventional hard-wired telephone is:
- A. Security.
- B. Lower cost.
- C. Mobility.
- D. Data speed.
19. Infrared waves are:
- A. Longer than radio waves.
- B. Longer than visible-light waves.
- C. Shorter than visible-light waves.
- D. Inaccurately named; they are really heat rays.
20. The GPS might be useful:
- A. For improving the performance of a LAN.
- B. For increasing the data speed in a wireless system.
- C. For minimizing noise in a wireless system.
- D. To a motorist who is lost.