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# Wireless Chapter 2

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Wireless Networking Chapter 3 Study Guide

True/False

___T 1. Electromagnetic waves travel through space at the speed of light.

___F 2. Whenever a wave moves to the maximum voltage, then down to the minimum voltage, and then returns back to the starting point, it has finished two cycles.

___T 3. The ASK 1 bit has a carrier signal (positive voltage) while a 0 bit has no signal (zero voltage).

___F 4. One of the units of measurement used to represent RF signal strength is Ohms.

___T 5. Mulitple copies of an RF signal may reach the receiver at different times due to reflection.

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____ 6. Which of the following is an electromagnetic wave? a. | light | c. | radio | b. | heat | d. | All of the above |

____ 7. Which of the following units is used to measure frequency? a. | decibel | c. | hertz | b. | volt | d. | byte |

____ 8. The term ____ describes the rate of electrical flow. a. | voltage | c. | resistance | b. | current | d. | electrical power |

____ 9. ____ modulation changes the number of waves representing one cycle. a. | Amplitude | c. | Frequency | b. | Phase shift | d. | Phase |

____ 10. Which type of modulation changes the starting point of the cycle to represent a change from a 1 bit to a 0 bit and vice versa? a. | AM | c. | DM | b. | FM | d. | PM |

____ 11. Which binary modulation technique is similar to frequency modulation? a. | amplitude shift keying | c. | phase shift keying | b. | frequency shift keying | d. | All of the above |

____ 12. Power of an electromagnetic signal such as one used in WLANs is measured by which unit? a. | millivolts | c. | milliohms | b. | milliamps | d. | milliwatts |

____ 13. When an RF signal moves from one medium to another of a different density the signal actually bends instead of traveling in a straight line. This is known as ____. a. | reflection | c. | refraction | b. | absorption | d. | scattering |

____ 14. Which describes the natural loss of signal strength through space? a. | scattering | c. | free space loss | b. | absorption | d. | delay spread |

____ 15. Which is a method of measuring RF power that can be used as a comparison between two values and gives a better picture of the loss or gain? a. | continuous scale | c. | absolute scale | b. | linear scale | d. | relative scale |

____ 16. What units are used to measure RF power gain and loss on a relative scale? a. | dB | c. | mW | b. | V | d. | ohm |

____ 17. Which value can be measured by the circuitry on a wireless NIC to determine if it is clear to send its transmission? a. | dB | c. | mW | b. | RSSI | d. | SNR |

____ 18. What is the term that describes the ratio of desired signal to undesired signal in the average power level of a transmission? a. | SNR | c. | RSSI | b. | dBm | d. | FSPL |

____ 19. What is the positive difference in amplitude between two signals? a. | propagation | c. | refraction | b. | gain | d. | delay spread |

____ 20. Which is caused by small objects or rough surfaces as an RF signal travels through the air? a. | reflection | c. | scattering | b. | refraction | d. | nullification |

____ 21. What phenomenon is described as multiple copies of a signal that reach a receiver at different times? a. | propagation | c. | multimode | b. | multipath | d. | multi-directional |

____ 22. What does a loss of 10 decibels mean with respect to the percent of power loss in mW? a. | 50% | c. | 30% | b. | 10% | d. | 90% |

Multiple Response
Identify one or more choices that best complete the statement or answer the question.

____ 23. Which of the following are characteristics of electromagnetic waves (Choose all that apply.) a. | square | c. | discrete | b. | continuous | d. | cycle |

____ 24. Which of the following are advantages of digital modulation over analog moduation? (Choose all that apply.) a. | makes better use of the available spectrum | c. | more power is required to transmit | b. | performs better when interference is present | d. | frequency and phase changes occur continuously |

____ 25. Which of the following are used to describe the behaviors of waves as they propagate? (Choose all that apply.) a. | diffraction | c. | resistance | b. | scattering | d. | absorption |

____ 26. What are the negative effects of delay spread? (Choose all that apply.) a. | upfade | c. | corruption | b. | amplification | d. | nulling |

Completion
Complete each statement.

27. A(n) DIGITAL signal has numerous starts and stops throughout the signal stream.

28. Resistance is measured in ohms and the total amount of resistance is called the IMPEDANCE

29. FREQUENCY shift keying is a binary modulation similar to phase modulation.

30. RF power gain and loss on a relative scale are measured in DECIBELS instead of mW.

31. The way in which RG signals travel is referred to as wave ____________.

Matching

Match each term with the correct statement below. a. | diffraction | f. | voltage | b. | attenuation | g. | scattering | c. | electrical power | h. | wavelength | d. | oscillating signal | i. | frequency | e. | modulation |

____ 32. voltage multiplied by the current

___D 33. up-and-down wave

___H 34. distance between the peaks of a wave

___I 35. rate at which an event occurs

___A 36. bending caused by an object in the path of the transmission

___E 37. modification to a signal to enable it to carry information

____ 38. equal to current times resistance

___B 39. loss of signal strength

___G 40. occurs when the RF signal comes in contact with elements in the air, such as rain or heavy dust particles

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