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Satellites in communication - class-V

Description: satellites in communication
Number of Questions: 20
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Tags: communication systems communication and mass media evs - i artificial satellite physics
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 How does communication between satellite be achieved

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. Using satellite cross-links

  2. Intersatellite links (ISLs)

  3. Through ground stations

  4. Both A and B

Show answer
Correct Option: D
Explanation:

A crosslink is when satellites communicate directly with eachother, instead of communicating with a ground station which, in turn, communicates with other satellites. Frequencies that are quickly attenutated in the atmosphere are commonly used, making the link undetectable and unjamable from the ground.


ISLs permits a satellite to communicate, when it is not visible from a receiving ground station, using a geostationary TLC satellite.

The downlink frequency in the C-band transponder is about

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. 6 GHz

  2. 4 GHz

  3. 14 GHz

  4. 11 GHz

Show answer
Correct Option: B
Explanation:

$Answer:-$ B

$C-Band(4-8GHz)$

Primarily used for satellite communications, for full-time satellite TV networks or raw satellite feeds. Commonly used in areas that are subject to tropical rainfall, since it is less susceptible to rainfade than Ku band (the original Telstar satellite had a transponder operating in this band, used to relay the first live transatlantic TV signal in 1962).

How do you describe the complete signal path of the satellite communications operation?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. Begins at a ground station, proceeds to an uplink, then to a downlink, and ends at a receiving ground station.

  2. From the satellite, to a downlink, then to a ground station

  3. Begins at a ground station, proceeds to an uplink, to the satellite itself, to a downlink, and ends at a receiving ground station

  4. All of these

Show answer
Correct Option: C
Explanation:

A communication satellite works like a relay station where signals transmitted by the ground stations are picked up by the satellite's receiver antennas(uplink), the signals are filtered, their frequency changed and amplified, and then routed via the transmit antennas(downlink) back down to Earth.

The earth area covered by a satellite radio beam is 

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. Footprint

  2. Bandwidth

  3. Beamwidth

  4. Zone

Show answer
Correct Option: A
Explanation:

The area of earth covered by radio beam from a satellite dish (transponder) is called satellite footprint.

Which is an application of satellite system?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. Whether forecasting

  2. Terrestrial communication

  3. Point to point communication

  4. None of the above

Show answer
Correct Option: A
Explanation:

Terrestrial communication has two stations with repeaters to strengthen the signal.

Point to point communication means the connection between two end points. e.g. telephone call
Satellites are used for whether forecasting.

Which of the following is not advantage of satellite communication?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. can reach over large geographical area

  2. circuit costs independent of distance

  3. broadcast possibilities

  4. none of the above

Show answer
Correct Option: D
Explanation:

A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.

It has a number of advantages-
1. Mobile communication can be easily established by satellite communication.
2. Satellite communication is economical compared with terrestrial communication particularly where long distances are involved.
3. User has control over their own network.
4. It spreads over a large geographical area.
5. Broadcast over very large distances is possible only due to these satellites.

In which of the following communication methods, the transmitted and receiving antennas can be oriented in any direction?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. Ground Wave propagation

  2. Satellite communication

  3. Sky wave propagation

  4. Space wave propagation

Show answer
Correct Option: B
Explanation:

The direction of transmission and receiving are both fixed in ground wave propagation, sky wave propagation and space wave propagation. However in satellite communication, the antennas are oriented in the required direction depending upon the position of satellite, so that the beam is aligned with the satellite.

Match List-1 with List-2. 

List-1 List-2
a. Point to point communication e. RADAR
b. broadcast communication f. AM radio
c. Line of sight g. FM radio communication
d. Satellite communication h. Traditional telephony
i. Mobile telephony
j. TV
evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. a-h; b-f,g,j; c-e; d-i,j

  2. a-e; b-i,j; c-h; d-g,f

  3. a-f ; b-h,i,j; c-g; d-e

  4. a-g; b-f,g,j; c-e; d-i,j

Show answer
Correct Option: A
Explanation:
(a-h): A point-to-point connection refers to a communications connection between two nodes or endpoints.
(b-f, g ,j): Reaches a wider range at faster speed.
(c-e) Line of sight is a type of propagation that can transmit and receive data only where transmit and receive stations are in view of each other without any sort of an obstacle between them.
(d-i, j) Signal transferring between the sender and receiver is done with the help of satellite.

The frequency of transmission of a ratio station is $30\, MHz$. The wavelength of the waves transmitted by the centre will be- 

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. $5$ meter

  2. $10$ meter

  3. $15$ meter

  4. $20$ meter

Show answer
Correct Option: B

Long range transmission of TV-signal is done by

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. space wave

  2. sky wave

  3. ground wave

  4. artificial satellite

Show answer
Correct Option: D
Explanation:

TV-signal ( $30: MHz$ - $300:MHz$) are not reflected by ionosphere. Therefore, sky-wave propagation is not possible and similarly ground and space wave is also not feasible. Hence, they are transmitted to artificial satellite from where they are transmitted back to the Earth.

What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. $\displaystyle\frac{1}{2}$

  2. $\displaystyle\frac{1}{3}$

  3. $\displaystyle\frac{1}{4}$

  4. $\displaystyle\frac{1}{8}$

Show answer
Correct Option: B
Explanation:

We uses three geostationary satellites placed at the vertices of an equilateral triangle, then the entire earth can be covered by the communication network, each satellite covers $1/3$ of the globe.

A ground receiver station is receiving a signal at (a) 5 MHz and (b) 100MHz, transmitted from a ground transmitter at a height of 400m located at a distance of 125km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder. Radius of earth = $6.4\times { 10 }^{ 6 }m$; maximum number density of electrons in ionosphere = ${ 10 }^{ 12 }{ m }^{ -3 }$ 


evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

  1. $9MHz$

  2. $5MHz$

  3. $4MHz$

  4. All of these.

Show answer
Correct Option: A
Explanation:
Height of the ground transmitter $=30\ cm$
Range of transmission $=100\ km$
maximum distance covered by space wave propagation is
$d=\sqrt{2\ Rh}$
$=\sqrt{2\times 64\times 10^{6}\times 300}$
$=62\ km$
critical frequency for ionospheric propagation is, 
$F _{C}=9(N _{max})^{112}$
$=9(10^{12})^{112}$
$=9\times 10^{6}=9\ MHZ$

For satellite communication which wave is used?

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. Space wave

  2. Sky wave

  3. Ground wave

  4. Microwave

Show answer
Correct Option: A
Explanation:

A space wave travels in a straight line from transmitting antenna to the receiving antenna. Space waves are used for line of sight communication as well as satellite communication.

State whether the given statement is True or False :

Remote sensing is a technique of collection of information about an object, without a physical contact.

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object and thus it is in contrast to on site observation. In modern usage, the term generally refers to the use of aerial sensor technologies to detect and classify objects on Earth.
Hence, the statement is true.

As the height of a satellite orbit gets lower, the speed of the satellite _________.

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. decreases

  2. increases

  3. remains the same

  4. none of the above

Show answer
Correct Option: B
Explanation:

$V=\sqrt { \cfrac { GMe }{ r }  } \ \therefore V\propto \cfrac { 1 }{ \sqrt { r }  } $

With decrease in $'r'$, velocity of satellite $increases$.

Let $R _s$ and $R _m$ be the distance of the geostationary satellite and moon from the center of earth. Then $\dfrac{R _m}{R _s}$ is

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. $(29)^{1/2}$

  2. $(29)^{2/3}$

  3. $29$

  4. $(29)^{3/2}$

Show answer
Correct Option: B

If the satellite is stopped sudden;y in its orbit which is at a distance radius of earth from earth's surface and allowed to fall freely into the earth. the speed with which it hits the surface of earth will be:

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. $38,525 km/s$

  2. $1,525 km/s$

  3. $18,525 km/s$

  4. $28,525 km/s$

Show answer
Correct Option: D

A remote -sensing satellite of earth revolves in a circular orbit at a height of $ 0.25 \times 10^6 $ m above the surface of earth. if earth's radius is $ 0.25 \times 10^6 $ m above the surface of earth. if earth's radius is $ 6.38 \times 10^6 m $ and $ g= 9.8 m/s^2 $, then the orbital speed of the satellite is :

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. $6.67 km/s$

  2. $7.76 km/s$

  3. $8.56 km/s$

  4. $9.13 km/s$

Show answer
Correct Option: A

What kind of battery used by older satellites?

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. Lithium

  2. Leclanche

  3. Hydrogen

  4. Magnesium

Show answer
Correct Option: C
Explanation:

Older satellite used $H-$ batteries.

State the chronological order in which the following events took place.
$1$. Launching of APPLE
$2$. Launching of Rohini
$3$. Antarctica expectation
$4$. Indian cosmonaut

physics artificial satellite communication and mass media understanding communication and impact of mass media satellites in communication

  1. $2 - 1 - 3 - 4$

  2. $2 - 3 - 1 - 4$

  3. $3 - 1 - 2 - 4$

  4. $4 - 1 - 2 - 3$

Show answer
Correct Option: D
Explanation:

a) Lunching of Apple - $1$ April, $1976$

b) Lunching of Rohini - $10$ Aug, $1979$
c) Indian cosmonaut - $1982$
(i.e. Rakesh Sharma, Indian air force pilot)
d) Antarctica expectation - $1965$
So, order is $d-a-b-c$.

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