Online Questions and Answers Topic Outline
- MCQs in Satellite System
- MCQs in Types of Satellite
- MCQs in Satellite Orbit
- MCQs in Uplink considerations
- MCQs in Demand Assignments Multiple Access
- MCQs in Antenna Tracking
- MCQs in Satellite Link Budgets
- MCQs in Satellite Path Loss
- MCQs in Satellite Figure of Merit
- MCQs in Ratio of Carrier to thermal Noise Power
- MCQs in Station Margin
- MCQs in VSAT
MCQs in Satellite Communications Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part II of the Series
51. The main function of a communications satellite is a/ an
- A. repeater
- B. reflector
- C. beacon
- D. observation platform
52. The key electronic component in a communications satellite is the
- A. telemetry equipment
- B. on-board computer
- C. command and control system
- D. transponder
53. A circular orbit around the equator with a 24-h period is called a/an
- A. elliptical orbit
- B. geostationary orbit
- C. polar orbit
- D. transfer orbit
54. A satellite stay in orbit because the following two factors are balanced
- A. Satellite weight and speed
- B. Gravitational force and centrifugal force
- C. Centripetal force and speed
- D. Satellite weight and the pull of the moon and sun
55. What is the height of a satellite in a synchronous equatorial orbit?
- A. 42000 mi
- B. 6800 mi
- C. 22,300 mi
- D. 35,860 mi
56. Most satellites operate in which frequency band?
- A. 30 to 300 MHz
- B. 300 MHz to 3 GHz
- C. 3 GHz to 30 GHz
- D. Above 300 GHz
57. The main power sources for a satellite are
- A. batteries
- B. solar cells
- C. fuel cells
- D. thermoelectric generators
58. The maximum height of an elliptical orbit is called the
- A. Perigee
- B. Apex
- C. Zenith
- D. Apogee
59. Batteries are used to power all satellite subsystems
- A. at all times
- B. only during emergencies
- C. during eclipse periods
- D. to give the solar arrays a rest
60. The satellite subsystem that monitors and controls the satellite is the
- A. propulsion subsystem
- B. power subsystem
- C. communications subsystem
- D. telemetry, tracking, and command subsystem
61. What is the basic technique used to stabilize a satellite?
- A. Gravity-forward motion balance
- B. Spin
- C. Thruster control
- D. Solar panel orientation
62. The jet thrusters are usually fired to
- A. maintain altitude
- B. put the satellite into the transfer orbit
- C. inject the satellite in the geosynchronous orbit
- D. bring the satellite back to earth.
63. Most commercial satellite activity occurs in which band(s)?
- A. L
- B. C and Ku
- C. X
- D. S and P
64. How can multiple earth stations share a satellite on the same frequencies?
- A. Frequency reuse
- B. Multiplexing
- C. Mixing
- D. Frequency hopping
65. What is the typical bandwidth of a satellite band?
- A. 36 MHz
- B. 40 MHz
- C. 70 MHz
- D. 500 MHz
66. Which of the following is not usually a part of a transponder are defined by the
- A. LNA
- B. Mixer
- C. Modulator
- D. HPA
67. The satellite communications channels in a transponder are defined by the
- A. LNA
- B. bandpass filter
- C. mixer
- D. input signals
68. The HPAs in most satellite are
- A. TWTs
- B. Klystrons
- C. Vacuum tubes
- D. Magnetrons
69. The physical location of a satellite is determined by its
- A. distance from the earth
- B. latitude and longitude
- C. reference to the stars
- D. position relative to the sun
70. The receive GCE system in an earth station performs what function(s)?
- A. Modulation and multiplexing
- B. Up conversion
- C. Demodulation and demultiplexing
- D. Down conversion
71. Which of the following types of HPA is not used in earth stations?
- A. TWT
- B. Transistor
- C. Klystron
- D. Magnetron
72. What is the common up-converter and down-converter IF?
- A. 36 MHz
- B. 40 MHz
- C. 70 MHz
- D. 500 MHz
73. What type of modulation is used on voice and video signals?
- A. AM
- B. FM
- C. SSB
- D. QPSK
74. What modulation is normally used with digital data?
- A. AM
- B. FM
- C. SSB
- D. QPSK
75. Which of the following is not a typical output from a GPS receiver?
- A. Latitude
- B. Speed
- C. Altitude
- D. Longitude
76. The total space loss of transmission and reception for two ground stations with uplink frequency 8GHz and a downlink of 6 GHz with angle of elevations of 3˚ and 7˚ A respectively is
- A. 403 dB
- B. 100 dB
- C. 20 dB
- D. 215 dB
77. The maximum propagation delay of a geostationary satellite is
- A. 278 ms
- B. 239 ms
- C. 300 ms
- D. 250 ms
78. The total propagation delay time from transmission to reception of signals from a ground transmitter to ground receiver with angle of elevation at 10 degrees respectively is
- A. 273 ms
- B. 239 ms
- C. 275 ms
- D. 260 ms
79. A satellite which simply reflects the signal without further amplification
- A. Passive satellite
- B. Active satellite
- C. Geostationary satellite
- D. Domestic satellite
80. Essentially a satellite ___________ is a radio repeater in the sky
- A. transponder
- B. comparator
- C. duplexer
- D. billboard
81. Satellite the orbits in a circular pattern with an angular velocity equal to that of the earth
- A. Geostationary
- B. Early Bird I
- C. Syncorn I
- D. Stationary satellite
82. Satellite that provide services within a single country
- A. Domsat
- B. Comsat
- C. Regional
- D. Global
83. The round-trip propagation delay between two earth stations through a geosynchronous satellite is
- A. 500 to 600 ms
- B. 300 to 400 ms
- C. 600 to 700 ms
- D. 400 to 500 ms
84. The signal path from earth station satellite
- A. Uplink signal
- B. Reflected signal
- C. Incident signal
- D. Downlink signal
85. Designed to receive a signal from a transmitting station on the ground and retransmit it to a receiving station located elsewhere
- A. Communication satellite
- B. Repeater
- C. Relay station
- D. Transponder
86. The signal path from satellite to earth-based receiver.
- A. Downlink signal
- B. Uplink signal
- C. Incident signal
- D. Reflected signal
87. A satellite position is measured by its __________ angle with respect to the horizon.
- A. elevation
- B. depression
- C. azimuth
- D. critical
88. The ________ angle measures the satellite position clockwise from the direction of true north.
- A. azimuth
- B. elevation
- C. depression
- D. critical
89. incidentally propose the geostationary scheme or orbit of the satellite in 1940s
- A. Arthur Clarke
- B. Carl Friedrich Gauss
- C. Samuel Morse
- D. Stephen Gray
90. When the satellite are spaced 4˚ of the 360˚ complete circle, how many parking spaces or orbit slots are available?
- A. 90
- B. 85
- C. 95
- D. 80
91. The control routine necessary to keep the satellite in position is referred to as
- A. station keeping
- B. station tracking
- C. station monitoring
- D. station maintaining
92. Refers to the satellite orientation with respect to the earth
- A. Satellite altitude
- B. Satellite position
- C. Satellite location
- D. Satellite orbit
93. The first intelsat satellite that was launched in 1965 was named
- A. Early Bird I
- B. Echo
- C. Telstar I
- D. Courier
94. The first satellite launched for a geosynchronous orbit but unfortunately lost during orbit injection
- A. Syncom I
- B. Telstar I
- C. Sputnik I
- D. Early Bird I
95. When the elevation angle of a geostationary satellite is 23˚ and the transmitting frequency is 3840 MHz, what is the free space loss in dB?
- A. 196 dB
- B. 200 dB
- C. 150 dB
- D. 100 dB
96. What is the propagation delay when a signal is transmitter by an earth station to a geosynchronous satellite about 38,500 km above earth’s equator and then received by the same earth station?
- A. 256 msec
- B. 128 msec
- C. 300 msec
- D. 400 msec
97. What is the free space attenuation of a satellite communications system operating at 36,000 km above the earth at 5.0 GHz?
- A. 198 dB
- B. 202 dB
- C. 142 dB
- D. 138 dB
98. Which of the following is the most common application of satellite?
- A. Surveillance
- B. Military application
- C. Communications
- D. Newscasting
99. Descending pass for a satellite means a pass from
- A. North to South
- B. South to North
- C. East to West
- D. West to East
100. Geostationary stationary satellites are located ___________ with respect to the equator.
- A. 0˚ longitude
- B. 0˚ latitude
- C. 90˚ latitude
- D. 45˚ latitude
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