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
- 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