Q1 INTELSAT stands for _____________
*
1/1
a. Intel Satellite
b. International Telephone Satellite
c. International Telecommunications Satellite
d. International Satellite
Q2 ___________ is an artificial body that is projected from earth to orbit either earth
(or) another body of solar systems. *
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a. Satellite
b. moon
c. sun
d. none of the above
Q3 __________________is defined as the use of orbiting satellites to receive, amplify
and retransmit data to earth stations. *
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a. Optical communication
b. Digital communication
c. Analog communication
d. Satellite communication
Q4 A communication satellite is a repeater between ______________and
_____________ *
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a. a transmitting station and a receiving station
b. a transmitting station and many receiving station
c. many transmitting station and many receiving station
d. none
Q5 A satellite link uses different frequencies for receiving and transmitting in order
to _____________ *
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a. avoid interference from terrestrial microwave links
b. avoid interference between its powerful transmitted signal and weak in coming signal
c. minimise free-space losses
d. maximise antenna gain
Q6 Why are VHF, UHF, and microwave signals used in satellite communication? *
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a) More bandwidth
b) More spectrum space
c) Are not diffracted by the ionosphere
d) Economically viable
Q7 The downlink frequency is lower than the uplink frequency. *
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True
False
Q8 What is the reason for shifting from C band to Ku band in satellite
communication? *
1/1
a) Lesser attenuation
b) Less power requirements
c) More bandwidth
d) Overcrowding
Q9 Which of the following bands cannot be used for satellite communication? *
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a) MF
b) Ku
c) X
d) C
Q10 What is application of satellite systems? *
1/1
a) whether forecasting
b) Terrestrial communication
c) point to point communication
d) None of the above
Q11 A synchronous satellite orbits the earth once in ___ *
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a) 24 hours
b) 12 hours
c) 6 hours
d) 1 hour
Q12 Geostationary satellites are located at a height of ______________ *
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a) 36000 km from earth’s surface
b) 360,000 km from earth’s surface
c) 3600,000 km from earth’s surface
d) 3600 km
Q12 Which area is least effectively coverd by geostationary satellites? *
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a) Equatorial region
b) Polar region
d) None of the above
Q13 Geo-stationery satellites, once placed in their correct orbit, remain correctly
positioned until the lifetime of their equipment expires. *
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a) true
b) false
Q14 Atmospheric drag has effect on ____________ *
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a) geostationary satellites
b). MEO
c). LEO satellites below about 1000 km.
d) None of these
Correct answer
c). LEO satellites below about 1000 km.
Feedback
(c). LEO satellites below about 1000 km.
Q15 The earth is not perfectly spherical? *
1/1
a) earth is not perfectly spherical, there being an equatorial bulge and a flattening at the poles
b) The earth is perfectly spherical, there being an equatorial bulge and a flattening at the poles
c) LEO satellites.
d) None of these
Q16 The period of a satellite, the time required for a satellite to make a complete
trip around the Earth, is determined by _________ law. *
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a) Kepler's
b) Ohm’s
c) Newton’s
d) None of the above
Q17 Which of the following is the first active satellite? *
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a) Echo I
b) Telstar I
c) Early Bird
d) Sputnik I
Q18 ___________ is a satellite that rotates around the earth in a low-altitude elliptical
or circular pattern. *
1/1
a) Geosynchronous satellite
b) Nonsynchronous satellite
c) Prograde satellite
d) Retrograde satellite
Q19 Is the geographical representation of a satellite antenna radiation pattern *
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A. Footprint
B. Spot
C. Earth
D. Region
Q20 What is the frequency range of C-band? *
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A. 8.5 to 12.5 GHz
B. 3.4 to 6.425 GHz
C. 12.95 to 14.95 GHz
D. 27.5 to 31 GHz
Q21 Is a loss of power of a satellite downlink signal due to earth’s atmosphere. *
1/1
A. Atmospheric loss
B. Path loss
C. Radiation loss
D. RFI
Q22 Point on the satellite obits closest to the earth. *
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A. Apogee
B. Perigee
C. Prograde
D. Zenith
Q23 The frequency of Ku band for satellite communications. *
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A. 6/4 GHz
B. 14/11 GHz
C. 12/14 GHz
D. 4/8 GHz
Correct answer
B. 14/11 GHz
Feedback
B. 14/11 GHz
Q24 What is the delay time for satellite transmission from earth transmitter to earth
receiver? *
1/1
A. 0.5 s
B. 1.0 s
C. 5 ms
D. 0.25 ms
Q25 The geometric shape of a non-circular orbit of a satellite is __________ *
1/1
A. Ellipse
B. Parabolic
C. Hyperbolic
D. Paraboloid
Q26 It is caused by the inertia of the satellite balanced by the earth’s gravitational
pull. *
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A. Centrifugal force
B. Centripetal force
C. Speed
D. Earth’s rotation
Q27 A satellite remains in orbit because the centrifugal force caused by its rotation
around the Earth is counterbalanced by Earth’s ____. *
1/1
A. Centripetal force
B. Inertia
C. Gravitational pull
D. Speed
Q28 The law that states that a satellite will orbit a primary body following an
elliptical path. *
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A. 1st law of Kepler
B. 2nd law of Kepler
C. 3rd law of Kepler
D. 4th law of Kepler
Q29 Kepler’s 2nd law is known as *
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A. Law of gravity
B. Law of areas
C. Newton’s law of motion
D. Harmonic law
Q30 The satellite is orbiting in the same direction as the Earth’s rotation and at
angular velocity greater than that of the Earth. *
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A. Retrograde
B. Synchronous
C. Prograde
D. Asynchronous
Q31 Satellite orbiting in the opposite direction as the Earth’s rotation and at angular
velocity less than that of the Earth. *
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A. Asynchronous
B. Synchronous
C. Posigrade
D. Retrograde
Q32 Low Earth Orbit (LEO) satellite orbits around the earth at a height of
approximately ____. *
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A. 3000 miles
B. 1000 miles
C. 575 miles
D. 370 miles
Q33 Medium Earth Orbit (MEO) satellite orbits around the earth at a height
approximately ____. *
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A. 3,000 miles to 6,000 miles
B. 4,000 miles to 8,000 miles
C. 6,000 miles to 12,000 miles
D. 8,000 miles to 10,000 miles
Q34 A satellite stays in orbit because the following two factors are balanced. *
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A. Satellite weight and speed
B. Gravitational pull and inertia
C. Centripetal force and speed
D. Satellite weight and the pull of the moon and sun
Q35 Geosynchronous satellites are high-altitude earth-orbit satellites with heights
about ____. *
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A. 22,300 miles
B. 21,000 miles
C. 8,000 miles
D. 10,400 miles
Q36 The point in an orbit which is located farthest from earth *
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A. Perigee
B. Apogee
C. Line of apsides
D. Point of shoot
Q37 The most popular satellite frequency range is 4 to 6 GHz and is called the ____
band. *
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A. C
B. L
C. Ka
D. Ku
Q38 All satellites rotate around the earth in an orbit that forms a plane that passes
through the center of gravity of earth called ____. *
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A. Focus
B. Geocenter
C. Orbit
D. Center
Q39 In satellite communications, type of orbit which is virtually all orbits except
those travel directly above the equator or directly over the North or the South
poles. *
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A. Equatorial orbit
B. Polar orbit
C. Geosynchronous orbit
D. Inclined orbit
Correct answer
B. Polar orbit
Feedback
B. Polar orbit
Q40 It is the angle between the earth’s equatorial plane and the orbital plane of the
satellite measured counterclockwise. *
1/1
A. Angle of elevation
B. Angle of azimuth
C. Angle of inclination
D. Angle of tetrahedron
Q41 The point where a polar or inclined orbit crosses the equatorial plane traveling
from north to south. *
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A. Ascending node
B. Line of nodes
C. Descending node
D. Diagonal nodes
Q42 When the satellite rotates in an orbit directly above the equator, usually in
circular pattern. This type of orbit is called ____. *
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A. Polar orbit
B. Synchronous orbit
C. Geosynchronous satellite
D. Equatorial orbit
Q43 The physical location of a satellite is determined by its *
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A. Distance from the earth
B. Latitude and longitude
C. Reference to the stars
D. Position relative to the sun
Q44 When the satellite rotates in a path that takes it over the north and south poles
in an orbit perpendicular to the equatorial plane. This type of orbit is called ____. *
1/1
A. Inclined orbit
B. Polar orbit
C. Geosynchronous orbit
D. Diagonal orbit
Q45 The azimuth angles and the angle of elevation is collectively known as ____. *
1/1
A. Antennas look angles
B. Antennas see angles
C. Antennas keep angles
D. Antennas satellite angles
Q46 The point on the surface of the Earth directly below the satellite. *
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A. Satellite point
B. Latitude
C. Longitude
D. Subsatellite point
Q47 It is the vertical angle formed between the direction of travel of an
electromagnetic wave radiated from an earth station antenna pointing directly
toward a satellite and the horizontal plane. *
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A. Angle of depression
B. Angle of inclination
C. Angle of elevation
D. Angle of azimuth
Q48 The minimum acceptable angle of elevation *
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A. 6 degrees
B. 4 degrees
C. 5 degrees
D. 7 degrees
Q49 It is the horizontal angular distance from a reference direction either the
southern or northern most point of the horizon. *
1/1
A. Angle of elevation
B. Latitude
C. Longitude
D. Azimuth
Q50 It is defined as the horizontal pointing angle of an earth station antenna. *
1/1
A. Angle of inclination
B. Azimuth angle
C. Latitude
D. Longitude
Q51 The geographical representation of a satellite antenna’s radiation pattern is
called a ____. *
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A. Field intensity
B. Footprint
C. Radiation propagation
D. Polarization
Q52 Sputnik I transmitted telemetry information for ______ *
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A. 1 week
B. 21 days
C. 15 days
D. 30 days
Q53 The angle of inclination of a satellite in polar orbit is nearly ____. *
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A. 45 degrees
B. 90 degrees
C. 30 degrees
D. 60 degrees
Q54 A satellite equipped with electronic devices to receive, amplify, convert and
retransmit signals. *
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a. Passive
b. Active
c. Uplink
d. Downlink
Q55 What band does VSAT first operate? *
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A. X-band
B. C-band
C. Ku-band
D. L-band
Q56 How do we measure the position of a satellite? *
1/1
A. By its elevation angle with respect to the horizon
B. By its azimuth angle measured clockwise from the direction of true north
C. Through the line of apsides
D. A and B are correct
Q57 How do you describe the complete signal path of the satellite communications
operation? *
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A. Begins at a ground station, proceeds to an uplink, then to a downlink, and ends at a
receiving ground station.
B. From the satellite, to a downlink, then to a ground station.
C. Begins at a ground station, proceeds to an uplink, to the satellite itself, to a downlink, and
ends at a receiving ground station
D. All of these
Q58 What is a passive satellite? *
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A. A satellite capable of receiving, amplifying, and retransmitting information to and from
earth stations.
B. A bent-pipe or a reflector which bounces a signal from one place to another.
C. A satellite which receives transmissions from earth stations, stored them on magnetic
tape, and rebroadcast them to ground stations farther along in its orbit.
D. A or C
Q59 Which of the following is not an advantage of geosynchronous orbit? *
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A. No need to switch from one satellite to another as satellites orbit overhead, therefore, no
breaks of transmission due to switching times.
B. High-altitude geosynchronous satellites can cover a much larger area
C. Geosynchronous satellites require higher transmit powers and more sensitive receivers
because of the longer distances and greater path loss.
D. Satellite remains almost stationary in respect to a given earth station, therefore, expensive
tracking equipment is not required at the earth stations.
Q60 Which of the following parameters (height of the satellite from earth, travel
time, rotation period, and the satellite’s line of sight) refer to low-altitude satellite? *
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A. 19,000 – 25,000 mi; 6,879 mi/hr; 24 hr; and 24-h availability time, respectively
B. 6,000 – 12,000 mi; 12,189 mi/hr; 5 – 12 hr; and 2- 4 hr per orbit, respectively
C. 100 – 300 mi; 17,500 mi/hr; 1 ½ hr, and ¼ or less per orbit, respective
D. 50 – 95 mi; 25,600 mi/hr, ½ hr; and 1/8 or less per orbit, respectively
Q61. 19,000 – 25,000 mi height; 6, 879 mi/hr travel time; 24-hr rotation; and 24-hr
availability time belong to what satellite? *
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A. Low-altitude satellites (circular orbit)
B. Medium-altitude satellites (elliptical orbit)
C. High-altitude satellites (geosynchronous orbit)
D. GLONASS
Q62 ____________ means the farthest distance from earth a satellite orbit reaches
while ____________ is the minimum distance. *
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A. Apogee and perigee, respectively
B. Perigee and apogee, respectively
C. A and B are the same
D. None of these
Q63 Refers to the line joining the perigee and apogee through the center of the
earth *
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A. Line of sight
B. Line of nodes
C. Equatorial nelt
D. Line of apsides
Q64 What is meant by the angle of elevation? *
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A. The angle formed between the direction of travel of a wave radiated from an earth station
antenna and the horizontal.
B. The horizontal pointing of an antenna
C. The angle subtended at the earth station antenna between the satellite and the horizontal
D. A or C is right
Q65 How does interference between uplink and downlink signals be prevented? *
1/1
A. By using different ground stations
B. By using different satellites
C. By using different carrier frequencies
D. All of these
Q66 What do you call of the signal path from the transmitter to satellite and from
the satellite to earth-based receiver? *
1/1
A. Downlink and uplink, respectively
B. Downlink
C. Uplink and downlink, respectively
D. Uplink
Q67 Why is it that the uplink is always higher in frequency than the downlink? *
1/1
A. Because the uplink suffers greater spreading or free-space loss of frequency than its lower
counterpart
B. Since an earth station aims upward with well-controlled antenna sidelobes
C. A and B are correct
D. None of these
Q68 What is meant by satellite footprint? *
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A. Is the earth area that the satellite can receive from or transmit to
B. Is the function of both the satellite orbit and height, and the type of antenna the satellite
uses.
C. The geographical representation of the satellite antenna’s radiation pattern.
D. All of the above
Q69 What (is)are the advantage(s) using 1-GHz and higher frequencies? *
1/1
A. Large amount of information can be sent due to large available bandwidth
B. Propagation characteristics are very consistent
C. Signal wavelengths are shorter
D. All of these are correct
Q70 Most satellites operate in which frequency band? *
1/1
A. 30 to 300 MHz
B. 300 MHz to 3 GHz
C. 3 GHz to 30 GHz
D. Above 300 GHz
Q71 Most commercial satellite activity occurs in which band(s)? *
1/1
a. L
b. C and Ku
c. X
d. S and P
Q72 The typical bandwidth of a satellite band is *
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A. 36 MHz
B. 40 MHz
C. 70 MHz
D. 500 MHz
Q73 What is the height of a satellite in a synchronous equatorial orbit? *
1/1
A. 42000 mi
B. 6800 mi
C. 22,300 mi
D. 35,860 mi
Q74 The expression for satellite link frequencies such as 4/6 GHz denotes that *
1/1
A. 4 GHz is the up-link and 6 GHz is the down-link frequency
B. 4 GHz is the down-link and 6 GHz is the up-link frequency
C. the system operates at a mean frequency of 5 GHz
D. one frequency is used as a back up for the other
Q75 Geosynchronous communication satellites travel around the earth in circular
orbits with a forward speed of about __________ km/h. *
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A. 11200
B. 0
C. 36000
D. 22800
Q76 Low-orbit satellites are not used for communications because they *
1/1
A. produce sonic booms
B. do not provide 24 hour/ day contact to the users on Earth
C. heat up and melt
D. none
Q77 The life time of a geosynchronous communication *
1/1
A. 5
B. 10
C. 20
D. 50
Q78 _______________ is a radio repeater in the sky. *
0/1
A. Amplifier
B. A communication satellite
C. Transceiver
D. None of the above
Correct answer
B. A communication satellite
Feedback
B. A communication satellite
Q80 The path followed by the radiated signal from the earth station transmitter to
the satellite is known as __________. *
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A. uplink path
B. downlink path
C. dual path
D. None of the above
Q81 The inclination of a prograde orbit always lies between ______________ *
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A. 270° and 360°
B. 180° and 270°
C. 90° and 180°
D. 0° and 90°
Q82 Coverage is not available beyond −+76° latitude i.e. regions in the north and
south poles are not covered by the _________________________. *
0/1
A. LEO
B. Non synchronous satellites
C. Geostationary satellites
D MEO
Correct answer
C. Geostationary satellites
Feedback
C. Geostationary satellites
Q83 It is the measurement of location east or west of the prime meridian at
Greenwich, the especially designated imaginary N-S line that passes through both
geographic poles and Greenwich. *
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A. Latitude
B. Longitude
Q84 Propagation delay time depends upon the ________________. *
0/1
A. Altitude of the satellite
B. Attitude of the satellite
C. Antenna beam
D. Satellite orbit
Correct answer
A. Altitude of the satellite
Feedback
A. Altitude of the satellite
Q85 Distance of the satellite from the surface of the earth is called as
_____________. *
1/1
A. Look angle
B. Footprint
C. Attitude
D. Altitude
Q86 It is the angle between the orbital plane and the earth’s equatorial plane. *
1/1
A. Azimuth angle
B. Elevation angle
C. Inclination angle
Q87 These satellites stay in line of sight of a particular earth station for a time of 2
to 4 hours/orbit. *
0/1
A. LEO
B. HEO
C. MEO
D. GEO
Correct answer
C. MEO
Feedback
C. MEO
Q88 _______________ are mainly used for communication and broadcast
applications. *
0/1
A. LEO satellite
B. MEO satellite
C. HEO satellite
Correct answer
C. HEO satellite
Feedback
C. HEO satellite
Q89 ______________ satellites undergo a large number of eclipses increasing the
number of charge/discharge cycles of the batteries which reduces their life. *
0/1
A. HEO satellite
B. LEO & MEO satellite
C. HEO & MEO satellite
Correct answer
B. LEO & MEO satellite
Feedback
B. LEO & MEO satellite
Q90 The deviation of the satellite from the predetermined path due to external
disturbances is known as ___________. *
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A. orbital perturbation
B. orbital drift
C. Both A & B
D. None of the above
Correct answer
C. Both A & B
Feedback
C. Both A & B
Q91 Keplerian equations governing the orbital parameters are valid only
if_________________ *
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A.The earth is a perfect sphere
B. No other gravitational forces affect the orbit like from the sun or the moon.
C. The satellite moves in a perfect vacuum without any atmospheric drag.
D. All the Above
Correct answer
D. All the Above
Feedback
D. All the Above
Q92 The Effect of Gravitational force of sun and moon is negligible for
_______________. *
0/1
A. LEO satellite
B. MEO satellite
C. HEO satellite
Correct answer
A. LEO satellite
Feedback
A. LEO satellite
Q93. The ___________ thus cause longitudinal drift of the GEO stationary satellite. *
0/1
A. Atmospheric drag
B. Oblatness and mascons
C. Eclipse
Correct answer
B. Oblatness and mascons
Feedback
B. Oblatness and mascons
Q94. Satellite longitudes which are west rather than east of the earth station are
most desirable to avoid eclipse. *
0/1
A. When satellite longitude is east of the earth station, the satellite enters eclipse during
daylight and early morning hours of the earth station. This can be undesirable if the satellite
has to operate on reduced battery power
B. When satellite longitude is west of the earth station, eclipse does not occur until the earth
station is in darkness when usage is likely to be low.
C. Both A & B
Correct answer
C. Both A & B
Feedback
C. Both A & B
Q95 Which of the following factor does NOT contribute to the drift of a
geostationary satellite from its stationary position in space? *
1/1
A. Pressure of solar radiations
B. Gravitational changes due to Sun and Moon.
C. Oblateness of the Earth
D. Weight of the satellite
Q96 For global communication, the number of satellites needed is *
1/1
A. 1
B. 3
C. 10
D. 5
Q97 The distance of a synchronous satellite from Earth’s surface is __________
km. *
1/1
A. 300
B. 10000
C. 35900
D. 5
Q98 For an elliptical orbit? *
0/1
A. 1<e<0
B. e=0
C. e=1
D. None of the above
Correct answer
A. 1<e<0
Feedback
A. 1<e<0
Q99 Find the orbital period of the satellite in a circular orbit 500 km above the
Earth’s surface *
1/1
A. 1.6 hrs
B. 3.2 hrs
C. 2.4 hrs
D. 6.4 hrs
Q100 The process of maneuvering a satellite within a preassigned window is
called *
1/1
A. Satellite keeping
B. Station controlling
C. Station keeping
D. Satellite controlling
PS means *
1/1
Global Projecting System
Global Positioning System
Global Processing System
Global Parsing System
In satellites, it includes control mechanism that support the payload operation. *
1/1
Bus
Payload
Ground segment
Space segment
The thermal control subsystem is used to maintain the _______________ of the
various spacecraft subsystem within specified limits. *
1/1
pressure
voltage
temperature
none of the above
A ____________ is a microwave repeater that receives uplink transmissions and
provides filtering, amplification, processing and frequency translation to the
downlink band for re-transmission. *
0/1
Satellite
Communication Subsystem
Transponder
Communication Subsystem or Transponder
Correct answer
Communication Subsystem or Transponder
Feedback
Answer: Communication Subsystem or Transponder
Thermal blankets and shields are used around AKM to provide protection against
damaging temperature caused due to AKM firing comes under the _____________ *
0/1
Active Thermal Control Technique
PassiveThermal Control Technique
Correct answer
PassiveThermal Control Technique
Feedback
Passive Thermal Control Technique
These are low power thrusters from a few milli-Newton to a few Newton which are
used for attitude and orbit control. *
1/1
Electrical Propulsion
Chemical Propulsion
The solar panels generate a ____________ which is used to operate the various
components of the satellite. *
1/1
direct current
alternating current
high dc voltage
none of the above
The ______________ refers to the equipment used to provide the service for which
the satellite has been launched. *
1/1
Payload
Bus
Antenna subsystem
Attitude control subsystem
What is an TWTA? *
1/1
The TWTA's are widely used in transponder to provide the final output power required to the
trans tube & its power supplies.
The TWTA's are widely used in transponder to provide the final input power required to the
trans tube & its power supplies.
(c) Either a or b.
(d) None of above
The three axes referred to the three-axis attitude stabilization are; except *
1/1
Pitch
Yaw
Roll
Speed
A system based on the accurate knowledge by the vessel of the position of each of
four satellites, as calculated by the time with respect to the user. *
1/1
GPS
LORAN
NAVSTAR
None of these
The quality of a space-link is measured in terms of the _______ ratio. *
1/1
C/N
S/N
G/T
EIRP
The losses which are constant No matter what precautions we might have taken,
still these losses are bound to occur are known as constant losses. For example
__________________ *
0/1
feeder losses
loss due to sky condition
loss due to weather condition
none of the above
Correct answer
feeder losses
Feedback
feeder losses
_________ is a loss of power of a satellite downlink signal due to earth’s
atmosphere. *
1/1
Atmospheric loss
Path loss
Radiation loss
RFI
_________________of a satellite refers to the maintenance of the satellite stability at
its assigned position. *
1/1
Attitude control subsystem
Communication subsystem
Thermal control subsystem
Propulsionl subsystem
There exists only two-way transmission from satellite to users in GPS system. *
0/1
True
False
Correct answer
False
Feedback
False
VSAT stands as______. *
1/1
Very small aperture terminal system
Vast small aperture terminal system
Virtual small aperture terminal system
None of these
To calculate the 3-D position (latitude, longitude and altitude) of a point of interest
or track movement, a GPS receiver must be locked on to the signal of at least
________ satellites. *
1/1
One
Two
Three
Four
The basic structure of a VSAT network consists of a hub station which provides a
broadcast facility to all the VSATs in the network and the VSATs themselves which
access the satellite in some form of___________. *
1/1
Multiple-access mode
Multiplexing
Channel
None of these
Power amplification in a transponder is usually provided by *
1/1
Klystron
TWT
Transistor
Magnetron
Most VSAT systems operate in the ________, although there are some C-band
systems in existence. *
1/1
L Band
Ku Band
Ka Band
None of the above
The most popular access method is________, which allows the use of comparatively
low-power VSAT terminals *
1/1
FDMA
CDMA
TDMA
None of the above
There are two primary classifications of communications satellite; one uses the
angular momentum of its spinning body to provide roll and yaw relative to earth’s
surface while an internal subsystem provides roll and yaw stabilization. What are
they? *
1/1
gyroscopic satellites
delayed repeater satellites
passive and active satellites
spinners and three-axis stabilizer satellites
What is an EIRP? *
1/1
It is a measure of radiated or transmitted power of an antenna. It can be completed from the
antenna gain & the power fed to the antenna input.
It is a measure of radiated or transmitted power of an antenna. It can be completed from the
antenna gain & the power fed from the antenna output.
Either a or b.
None of above
It is a satellite navigation system that furnishes location and time information in all
climate conditions to the user. *
1/1
GNSS
GPRS or General Packet Radio Service
GPS or Global Positioning System
Electric heaters are generally used during eclipses comes under *
1/1
Active Thermal Control Technique
Passive Thermal Control Technique
The most common device used as an LNA is *
1/1
zener diode
tunnel diode
IMPATT
Shockley diode
A transponder that demodulates the baseband signals and then demodulates a
carrier is known as ____ transponder. *
0/1
Single-conversion
Double-conversion
Regenerative
Degenerative
Correct answer
Regenerative
Feedback
Regenerative
It to monitor and control the satellite right from the lift off stage to the end of its
operational life in space. *
0/1
attitude control system
telemetry, tracking and control subsystem
propulsion subsystem
None of these
Correct answer
telemetry, tracking and control subsystem
Feedback
telemetry, tracking and control subsystem
The power system includes the primary sources as ___________ for running the
earth station. *
0/1
the standard AC lines
Solar power
battery
Wind energy
Correct answer
the standard AC lines
Feedback
the standard AC lines
What is the reason for carrying multiple transponders in a satellite? *
1/1
More number of operating channel
Better reception
More gain
Redundancy
A ____ circuit in the transponder performs the frequency conversion. *
1/1
HPA
Mixer
Local oscillator
BPF
In GPS, the individual user need only a GPS __________. *
1/1
transmitter
receiver
Transmitter and receiver
The difference between the power sent at one end and received at the receiving
station is known as ______________ *
1/1
Radiation loss
Transmission losses.
Power loss
Dielectric loss
How can satellite maintains its desired orbit consistently? *
1/1
Using small on-board rocket thrusters
Through using guidance system
By telemetry channel
All of these
The function of the _________________ is to provide DC power to all subsystems
throughout the life of the spacecraft. *
1/1
Attitude Control Subsystem
Thermal Control Subsystem
Propulsion Subsystem
Power Subsystem
Describe the spin stabilized satellites. *
1/1
In a, spin stabilized satellites, the body of the satellite spins at about 30 to 100 rpm about the
axis perpendicular to the orbital plane.
In a, spin stabilized satellites, the body of the satellite spins at about 300 to 1000 rpm about
the axis perpendicular to the orbital plane.
a&b
None of above
___________________ satellites have more power generation capability *
1/1
3 – axis stabilized
spin stabilized
None of these
Batteries are used to power all satellite subsystems *
1/1
At all times
Only during emergencies
During eclipse periods
To give the solar arrays a rest
To calculate the 2-D position (latitude and longitude) of a point of interest or track
movement, a GPS receiver must be locked on to the signal of at least ________
satellites. *
1/1
One
Two
Three
Four
The key electronic component in a communications satellite is the
__________________ *
1/1
Telemetry
Command and Control system
On-board computer
Transponder
Which of the following is not a typical output from the GPS receiver? *
1/1
Latitude
Speed
Altitude
Longitude
These are medium and high power thrusters from hundreds of Newton to several
tens of thousands of Newton which are used for orbit changes during launch
phase *
0/1
Electrical Propulsion
Chemical Propulsion
Correct answer
Chemical Propulsion
Feedback
Chemical Propulsion
Advantages of Global Positioning System (GPS) *
0/1
It provides reliable information as it is updated constantly.
Allows the determination of exact location, distance and speed
Permits tracking and measuring weather conditions.
All the above
Correct answer
All the above
Feedback
All the above
By using pseudo ranging method, two dimensional and three dimensional GPS
positions can be located. *
1/1
True
False
An electronic system called transponder of the communications satellite is used *
1/1
For frequency translations
To retransmit signals
To receive signals
All of the above
The jet thrusters are usually fired to *
1/1
Maintain attitude
Put the satellite into the transfer orbit
Inject the satellite into the geosynchronous orbit
Bring the satellite back to the earth
The main power sources for a satellite are *
1/1
Batteries
Solar cells
Fuel cells
Thermoelectric generators
The basic technique used to stabilized a satellite is *
1/1
Gravity-forward motion balance
Spin
Thrusters control
Solar panel orientation
The _____________ of a satellite refers to its orientation in space. *
1/1
Altitude
Footprint
Attitude
None of the above
The circuit that provides channelization in a transponder is the *
1/1
Mixer
Local oscillator
Bandpass filter
HPA
It is mainly to generate forces which acts on the center of the mass of the
satellite. *
0/1
propulsion subsystem
telemetry, tracking and control subsystem
attitude control system
None of the above
Option 5
Option 6
Option 7
Correct answer
propulsion subsystem
Feedback
propulsion subsystem
The GPS system consists of three segments: *
3/3
The space segment: the GPS satellites
The control system
The user segment
The earth segment
It performs basic function of receives the uplink frequency, amplification of the
received signal, demodulated and re-modulation is done to create the downlink
signal. *
1/1
Single conversion transponder
Double conversion transponder
Regenerative transponder
Multi channel transponder
The input circuit to a transponder is the ____. *
1/1
BPF
HPA
LNA
Any of these
What is meant by payload? *
1/1
The payload refers to the equipment used to provide the service for which the satellite has
been launched.
The payload refers to the equipment used to provide the service for which the satellite has
been stabilize in orbit.
a&b
None of above
What is meant by EIRP? *
1/1
Equivalent Isotropic Radiated Power
Energy Isotropic Radiated Power
Equivalent Isotropic Resonance Power
none of these
The actual user information conveyed through the satellite system. *
1/1
Bus transmission
Payload
Prograde
Retrograde
