# MCQ in Satellite Communications Part 2 | ECE Board Exam

(Last Updated On: May 3, 2020) This is the Multiples Choice Questions Part 2 of the Series in Satellite Communications as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Satellite System
• MCQ in Types of Satellite
• MCQ in Satellite Orbit
• MCQ in Demand Assignments Multiple Access
• MCQ in Antenna Tracking
• MCQ in Satellite Link Budgets
• MCQ in Satellite Path Loss
• MCQ in Satellite Figure of Merit
• MCQ in Ratio of Carrier to thermal Noise Power
• MCQ in Station Margin
• MCQ in VSAT

#### Continue Practice Exam Test Questions Part 2 of the Series

51. The main function of a communications satellite is a/ an

A. repeater

B. reflector

C. beacon

D. observation platform

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

57. The main power sources for a satellite are

A. batteries

B. solar cells

C. fuel cells

D. thermoelectric generators

Solution:

58. The maximum height of an elliptical orbit is called the

A. Perigee

B. Apex

C. Zenith

D. Apogee

Solution:

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

Solution:

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

Solution:

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

Solution:

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.

Solution:

63. Most commercial satellite activity occurs in which band(s)?

A. L

B. C and Ku

C. X

D. S and P

Solution:

64. How can multiple earth stations share a satellite on the same frequencies?

A. Frequency reuse

B. Multiplexing

C. Mixing

D. Frequency hopping

Solution:

65. What is the typical bandwidth of a satellite band?

A. 36 MHz

B. 40 MHz

C. 70 MHz

D. 500 MHz

Solution:

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

Solution:

67. The satellite communications channels in a transponder are defined by the

A. LNA

B. bandpass filter

C. mixer

D. input signals

Solution:

68. The HPAs in most satellite are

A. TWTs

B. Klystrons

C. Vacuum tubes

D. Magnetrons

Solution:

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

Solution:

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

Solution:

71. Which of the following types of HPA is not used in earth stations?

A. TWT

B. Transistor

C. Klystron

D. Magnetron

Solution:

72. What is the common up-converter and down-converter IF?

A. 36 MHz

B. 40 MHz

C. 70 MHz

D. 500 MHz

Solution:

73. What type of modulation is used on voice and video signals?

A. AM

B. FM

C. SSB

D. QPSK

Solution:

74. What modulation is normally used with digital data?

A. AM

B. FM

C. SSB

D. QPSK

Solution:

75. Which of the following is not a typical output from a GPS receiver?

A. Latitude

B. Speed

C. Altitude

D. Longitude

Solution:

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

Solution:

77. The maximum propagation delay of a geostationary satellite is

A. 278 ms

B. 239 ms

C. 300 ms

D. 250 ms

Solution:

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

Solution:

79. A satellite which simply reflects the signal without further amplification

A. Passive satellite

B. Active satellite

C. Geostationary satellite

D. Domestic satellite

Solution:

80. Essentially a satellite ___________ is a radio repeater in the sky

A. transponder

B. comparator

C. duplexer

D. billboard

Solution:

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

Solution:

82. Satellite that provide services within a single country

A. Domsat

B. Comsat

C. Regional

D. Global

Solution:

83. The round-trip propagation delay between two earth stations through a geosynchronous satellite is

A. 600 to 700 ms

B. 300 to 400 ms

C. 500 to 600 ms

D. 400 to 500 ms

Solution:

84. The signal path from earth station satellite

B. Reflected signal

C. Incident signal

Solution:

85. Designed to receive a signal from a transmitting station on the ground and retransmit it to a receiving station located elsewhere

A. Repeater

B. Communication satellite

C. Relay station

D. Transponder

Solution:

86. The signal path from satellite to earth-based receiver.

A. Incident signal

D. Reflected signal

Solution:

87. A satellite position is measured by its __________ angle with respect to the horizon.

A. azimuth

B. depression

C. elevation

D. critical

Solution:

88. The ________ angle measures the satellite position clockwise from the direction of true north.

A. azimuth

B. elevation

C. depression

D. critical

Solution:

89. incidentally propose the geostationary scheme or orbit of the satellite in 1940s

A. Stephen Gray

B. Carl Friedrich Gauss

C. Samuel Morse

D. Arthur Clarke

Solution:

90. When the satellite are spaced 4˚ of the 360˚ complete circle, how many parking spaces or orbit slots are available?

A. 95

B. 85

C. 90

D. 80

Solution:

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

Solution:

92. Refers to the satellite orientation with respect to the earth

A. Satellite location

B. Satellite altitude

C. Satellite position

D. Satellite orbit

Solution:

93. The first intelsat satellite that was launched in 1965 was named

A. Courier

B. Echo

C. Telstar I

D. Early Bird I

Solution:

94. The first satellite launched for a geosynchronous orbit but unfortunately lost during orbit injection

A. Telstar I

B. Syncom I

C. Sputnik I

D. Early Bird I

Solution:

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. 150 dB

B. 200 dB

C. 196 dB

D. 100 dB

Solution:

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. 128 msec

B. 256 msec

C. 300 msec

D. 400 msec

Solution:

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. 138 dB

B. 202 dB

C. 142 dB

D. 198 dB

Solution:

98. Which of the following is the most common application of satellite?

A. Surveillance

B. Military application

C. Communications

D. Newscasting

Solution:

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

Solution:

100. Geostationary stationary satellites are located ___________ with respect to the equator.

A. 0˚ longitude

B. 0˚ latitude

C. 90˚ latitude

D. 45˚ latitude

Solution:

#### Questions and Answers in Satellite Communications Series

Following is the list of multiple choice questions in this brand new series:

MCQ in Satellite Communications
PART 1: MCQ from Number 1 – 50                        Answer key: PART 1
PART 2: MCQ from Number 51 – 100                   Answer key: PART 2
PART 3: MCQ from Number 101 – 150                 Answer key: PART 3
PART 4: MCQ from Number 151 – 200                 Answer key: PART 4
PART 5: MCQ from Number 201 – 250                 Answer key: PART 5
PART 6: MCQ from Number 251 – 300                 Answer key: PART 6
PART 7: MCQ from Number 301 – 350                 Answer key: PART 7

### Complete List of MCQ in Communications Engineering per topic

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