Data Communication and Networking – Transmission Media – Unguided Media – Radio Communication / Terrestrial Microwave Communication / Satellite Communication MCQs

This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Transmission Media – Unguided Media – Radio Communication, Terrestrial microwave communication, satellite communication”.
 

1
. The section of the electromagnetic spectrum defined as radio communication is divided into _______ bands
  • 5
  • 6
  • 7
  • 8
2
. The two highest radio communication bands use frequencies propagated mainly through _______
  • space
  • the ionosphere
  • the troposphere
  • the atmosphere
3
. Radio communication ranges from a frequency of _______ to a frequency of _______
  • 3 KHz; 300 MHz
  • 3 KHz; 300 GHz
  • 3 MHz; 300 GHz
  • 3 GHz; 300 THz
4
. When radio waves travel from the lowest portion of the atmosphere, hugging the earth, this is called _______ propagation.
  • surface
  • tropospheric
  • ionospheric
  • line-of-sight
5
. Long-range radio navigation uses frequencies in the _______ ranges.
  • VLF and LF
  • LF and MF
  • MF and HF
  • HF and UHF
6
. AM radio uses frequencies in the _______ range
  • LF
  • MF
  • HF
  • EHF
7
. CB radio uses frequencies in the _______ range
  • LF
  • MF
  • HF
  • EHF
8
. FM radio uses frequencies in the _______ range
  • LF
  • MF
  • HF
  • VHF
9
. Mobile telephones use frequencies in the _______ range.
  • UHF
  • MF
  • HF
  • EHF
10
. In the transmission of terrestrial microwaves, _______ can regenerate the signal at each antenna
  • repeaters
  • bridges
  • routers
  • any of the above
11
. In a _______ a wide range of incoming waves is directed to a common point called the focus
  • repeater
  • satellite
  • parabolic dish antenna
  • any of the above
12
. Terrestrial microwave communication can use _______ for transmission
  • repeaters
  • parabolic dish antennas
  • horn antennas
  • all of the above
13
. What is the advantage of using a satellite in microwave communication?
  • The limitations imposed on distance by the earth's curvature is reduced.
  • Remote areas can be serviced.
  • Leasing time or frequencies is relatively inexpensive.
  • All of the above
14
. Frequencies for satellite communication are in the _______ range
  • millihertz
  • megahertz
  • gigahertz
  • terahertz
15
. A geosynchronous orbit is 22,000 miles from earth at the _______.
  • North Pole
  • Tropic of Capricorn
  • equatorial plane
  • a and b
16
. The minimum number of geosynchronous satellites needed to cover the earth is _______
  • 1
  • 2
  • 3
  • 4
17
. In cellular telephony, a _______ is a service area containing an antenna and controlled by the cell office.
  • cell
  • MTSO
  • local loop
  • band
18
. One _______ controls many _______.
  • cell; MTSOs
  • antenna; MTSOs
  • cell; antennas
  • MTSO; cells
19
. The MTSO is responsible for _______
  • coordinating communication between the cell offices and the telephone central office
  • connecting cells
  • recording call information and billing
  • all of the above
20
. Cell size is a function of _______.
  • weather conditions
  • population
  • latitude
  • MTSO type
21
. Each cell can access _______ channels.
  • 40
  • 400
  • 416
  • 432
22
. An MTSO searches for the location of a mobile phone by sending query signals to each cell in a process called _______.
  • transmitting
  • paging
  • receiving
  • handoff
23
. The MTSO can change the channel carrying a call through a process called _______.
  • transmitting
  • paging
  • receiving
  • handoff
24
. Handoff is necessary when ________
  • a mobile phone initiates a call to a land phone
  • a land phone initiates a call to a mobile phone
  • a mobile phone calls a mobile phone
  • the mobile phone moves from one cell to another
25
. _______ is a cellular data standard providing low-speed digital service
  • FM
  • ASCS
  • CDPD
  • OSI
26
. A received signal is often not exactly the same as the original signal due to _______
  • attenuation
  • distortion
  • noise
  • all of the above
27
. When a signal loses energy in overcoming the resistance of a medium, this is called _______
  • attenuation
  • distortion
  • noise
  • all of the above
28
. The purpose of _______ is to compensate for an attenuated signals loss
  • an antenna
  • an amplifier
  • a transmitter
  • an LED
29
. The _______ measures the relative strengths of two signals or a signal at two different points
  • decibel
  • power
  • Shannon capacity
  • signal-to-noise ratio
30
. A loss of 3 dB is equivalent to _______
  • losing 3 times the power
  • losing half the power
  • gaining 3 times the power
  • gaining half the power
31
. What formula calculates the dB of a signal at points 1 and 2 (P1and P2)?
  • dB = P2/P1
  • dB = log10(P2/P1)
  • dB = 10log10 (P2/P1)
  • dB = 10 (P2/P1)
32
. When a signal changes its form or shape, this type of transmission impairment is called _______
  • attenuation
  • distortion
  • noise
  • all of the above
33
. The performance of transmission media is often measured by _______
  • throughput
  • propagation speed
  • propagation time
  • all of the above
34
. Throughput is usually measured in _______
  • bps
  • decibels
  • wavelengths
  • power
35
. Propagation speed is usually measured in _______
  • decibels
  • wavelengths
  • power
  • m/s
36
. The propagation time is _______
  • distance / propagation speed
  • propagation speed / distance
  • distance / decibel
  • distance / wavelength
37
. The _______ of a sine wave is dependent on its frequency and its medium
  • amplitude
  • phase
  • wavelength
  • any of the above
38
. The wavelength is the distance a simple signal can travel _______.
  • in one second
  • in one ms
  • in one period
  • none of the above
39
. In the formula λ = c/f, c is the _______
  • wavelength
  • frequency
  • speed of light in a vacuum
  • propagation speed
40
. One micron is _______ meters
  • 0.01
  • 0.001
  • 0.000001
  • 0.000000001
41
. The Shannon capacity formula gives us the _______ for a channel
  • theoretical highest bandwidth
  • theoretical highest data rate
  • maximum decibels available
  • signal-to-noise ratio
42
. What is the theoretical highest data rate for a common telephone line?
  • 3.486 Kbps
  • 34.86 Kbps
  • 348.6 Kbps
  • 3486 Kbps
43
. The Shannon capacity is a function of _______
  • the channel bandwidth
  • the signal-to-noise ratio
  • the channel power
  • a and b

 
 
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