Mobility Chapter 3

1. 11. A frequency of 5 million cycles per second is also expressed as:

   1. AA. 5 dBm
   2. BB. 5 GHz
   3. CC. 5 MHz
   4. DD. 5 dBi
2. 2 2. A coworker tells you that the company’s Wi-Fi network operates at 5 GHz and is in the Very High Frequency (VHF) range. You disagree with the coworker. What frequency range does the 5 GHz wireless network actually operate in?

   1. AA. High Frequency (HF)
   2. BB. Super High Frequency (SHF)
   3. CC. Ultra High Frequency (UHF)
   4. DD. Tremendously High Frequency (THF)
3. 3 3. If a radio wave has peak amplitude of +3, what would its peak-to-peak amplitude measurement be?

   1. AA. |6|
   2. BB. 0
   3. CC. –3
   4. DD. –6
4. 4 4. Your company wants you to help design a wireless network that uses digital modulation. You decide to use a modulation method that rapidly changes frequencies within a range. Which modulation method is appropriate in this instance?

   1. AA. Direct Sequence Spread Spectrum (DSSS)
   2. BB. Amplitude Modulation (AM
   3. CC. Frequency Modulation (FM)
   4. DD. Frequency Hopping Spread Spectrum (FHSS)
5. 55. Which of the following would be the phase difference of a wave that starts at a quarter length of a previous wave?

   1. AA. 4 dB
   2. BB. |4|
   3. CC. 90 degrees
   4. DD. 0.25Hz
6. 6 7. Which of the following can reduce RF propagation when radio waves partially penetrate an object but are split into multiple paths?

   1. AA. Reflection
   2. BB. Refraction
   3. CC. Diffraction
   4. DD. Absorption
7. 7 8. What is the signal power difference at the Half Power Beamwidth (HPBW) of an antenna?

   1. AA. 3 dBi
   2. BB. 0.5 dB
   3. CC. –3 dB
   4. DD. –3 dBp
8. 810. You receive complaints from a manager of a small branch office that the wireless network performance has gotten worse over the past few days, but is still working. Which of the following could affect performance of the wireless network?

   1. AA. Antennas repositioned on the wireless router from vertical to horizontal
   2. BB. Power supply unplugged from the wireless router
   3. CC. Active gain set to a higher level on the wireless router
   4. DD. Increase of decibels by +3 dB
9. 912. Which of the following is used to measure isotropic antenna power levels?

   1. AA. dBd
   2. BB. dBi
   3. CC. dBm
   4. DD. dBc
10. 1013. You consult for a company that has a sudden Internet outage. They are located in a remote area outside of town that is not serviced by cable or DSL. When you arrive on site, you are told that the Internet connection comes from an antenna on the roof. There are several antennas attached to a mast on the roof. What type of antenna provides Internet service to this company?

    1. AA. Yagi
    2. BB. Parabolic dish
    3. CC. Planar
    4. DD. Dipole

11. 1114. How many degrees are covered in an omnidirectional antenna’s horizontal plane?

    1. AA. 90
    2. BB. 120
    3. CC. 360
    4. DD. 180
12. 1215. Which type of antenna is most likely to be used to receive UHF and VHF television signals?

    1. AA. Planar
    2. BB. Parabolic
    3. CC. Yagi
    4. DD. Sector
13. 1316. You need to construct a secure area for electrical equipment to prevent RF interference and leakage. Which of the following would you use?

    1. AA. Faraday cage
    2. BB. Attenuator
    3. CC. RF filter
    4. DD. RF noise generator
14. 1417. What is the term for a “perfect” antenna that broadcasts in all directions equally, in the pattern of a sphere?

    1. AA. Semi-directional
    2. BB. Omnidirectional
    3. CC. Dipole
    4. DD. Isotropic
15. 1518. What is another term for Free Space Path Loss (FSPL)?

    1. AA. Refraction
    2. BB. Diffraction
    3. CC. Attenuation
    4. DD. Spreading
16. 1619. The process of changing or varying properties of a wave or signal is called:

    1. AA. Attenuating
    2. BB. Amplifying
    3. CC. Interference
    4. DD. Modulation
17. 1720. What is the term used to describe the proportion of the strength of an RF transmission to the level of interference present?

    1. AA. Attenuation
    2. BB. Decibel
    3. CC. Signal-to-noise ratio
    4. DD. Peak-to-trough ratio

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