TSM 320 Carolinas College Number of Satellites in the GEO Systems Exam Practice

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abbs32

Computer Science

TSM 320

Carolinas College of Health Sciences

TSM

Description

The manner in which a wireless signal move is often referred to as ………………………………… behavior .

When a wave hits an object that is bigger than its wavelength the wave may bounce in different direction and this is called ………………………………..

Antennas are active element and have gain such as OpAmp. T F

Directivity of antennas are based on the gain of antennas. T F

Active gain is related to antennas and passive gains are related to amplifier. T F

Multipath can degrade the strength and quality of the received signal and even cause corruption or cancelled signals due to the effect of different spreading delay of received signal. T F

When it comes to degradation of signal in its propagation path the inverse square law is applied. This law states that the change in power of a signal is equal to 1 divided by the square of the change in

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Fall2020 TSM320 test 1) Inter-satellite handover is not very common in…………… satellites. 2)What is the minimum number of satellites in the GEO systems satellite to cover the whole globe? 24 3) Calculate the round-trip time propagation delay for a satellite in LEO with altitude of 300 miles. Assume speed of light is 186282 miles/sec. 4. Name several characteristics of radio frequency. 5. …………………………. can most easily be described as multiple reflections. 6. Signals with the same phase has a constructive amplitude, but signals with different phase have destructive amplitude consequences. T F 7. The phase difference between two signals is very important to understand the effects of an RF phenomenon known as …………………………… 8. low frequency is used for dense urban area and high frequency are used for rural area. T F 9. Short wavelength radio corresponds to low frequency transmission. T F 10. ……………………………..is the bending and the spreading of an RF signal as it passes through a medium. 11. Number of oscillation in one second is called wavelength. T F 12. The signal received at end use with lower level than ……………………of the receiver device will not be detected and it is considered to be noise. 13. The manner in which a wireless signal move is often referred to as ………………………………… behavior . 14. When a wave hits an object that is bigger than its wavelength the wave may bounce in different direction and this is called ……………………………….. 15. Antennas are active element and have gain such as OpAmp. T F 16. Directivity of antennas are based on the gain of antennas. T F 17. Active gain is related to antennas and passive gains are related to amplifier. T F 18. Multipath can degrade the strength and quality of the received signal and even cause corruption or cancelled signals due to the effect of different spreading delay of received signal. T F 19. When it comes to degradation of signal in its propagation path the inverse square law is applied. This law states that the change in power of a signal is equal to 1 divided by the square of the change in………………………… 20. What are WLAN modes of operation/configurations? 21. What are the main factors need to be considered when you design a WLAN? 22. What is MIMO in WLAN and how is it used to enhance the system performance? 23. FHSS is used in all WLAN standards? T F 24. FHSS is used in Bluetooth. T F 25. What is the origin of the “802.11”? 26. Wifi alliance rename all 802.11. what are the new name /labelling of the 802.11 technologies (a,,b,g,n,ac,ax)? 27. 802.11n can transmit up to 600 Mbps using 4 by 4 MIMO. T F 28. What is the origin of Bluetooth? 29. How do you prevent WiFi wireless jamming caused by Bluetooth? 30. WLANs often use asymmetric encryption methods. T F 32) Closer the satellite to the center of the earth, slower the orbital speed of the satellite. T F 33) What are the most difficult/obstacle problem in the space for utilizing it more efficiently? 34) What are different types of orbits with their specific characteristics? 35) What are the approximate number of satellites launched from 1956 and what is the approximate number of functioning satellites? 36) The speed of a satellite depends on the distance (altitude) of satellite from the center of the earth. T F 37) An error of 0.00025 seconds exists between a satellite and a GPS receiver which are 31500 km apart. Express this error in km i. 0.5 km ii. 7 km iii. 750 km iv. 45 km v. 75 km 38) What is the main factor(s) differentiate between wireless technologies? 39) WiMAX is another wireless DSL technology. T F 40) 802.16, 802.11, 802.15, and 802.3 were designed and ratified by a. IEEE b. WLAN Aliance c. IETF d. None of the above
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Explanation & Answer

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1

Fall2020

TSM320 Test

[Institution]
[Name]

Fall2020

TSM320 Test

2

1) Inter-satellite handover is not very common in ISL satellites.

2) What is the minimum number of satellites in the GEO systems satellite to cover the
whole globe?24

3) Calculate the round-trip time propagation delay for a satellite in LEO with altitude
of 300 miles. Assume speed of light is 186282 miles/sec.

Distance =300 miles
Propagation speed =1.86282 * 105 m/s
Tp is propagation time =Distance/propagation speed
Tp =300 (1609.344) / 1.86282*105 sec
Tp = 482803/1.86282*105 sec
=2.59 *1012 sec

4. Name several characteristics of radio frequency.
Wavelength is long than infrared light in the electromagnetic spectrum
Amplitude corresponds to the electrical field of the wave
Frequency- between 30 (Hz) and 300 gigahertz (GHz)
5. Scattering can most easily be described as multiple reflections.
6. Signals with the same phase has a constructive amplitude, but signals with different phase
have destructive amplitude consequences. T F

Fall2020

TSM320 Test

3

7. The phase difference between two signals is very important to understand the effects of
an RF phenomenon known as multipath.
8. Low frequency is used for dense urban area and high frequency are used for rural area. T
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