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Satellite Communication MCQ Questions & Answers

Satellite Communication MCQs : This section focuses on the "Satellite Communication". These Multiple Choice Questions (MCQs) should be practiced to improve the Satellite Communication skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

What is the reason for shifting from c band to ku band in satellite communication?

A. Lesser attenuation
B. Less power requirements
C. More bandwidth
D. Overcrowding

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Question 2

Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.


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Question 3

The useful operational life of INSAT-IB (launched in 1983) is expected to end by

A. 1992-93
B. 1991-92
C. 1989-90
D. 1993-94

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Question 4

The present total cost per watt of power generation in geosynchronous orbit is nearly Rs.

A. 20
B. 50
C. 100
D. 5

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Question 5

Which one of the following statements regarding compandor is FALSE?

A. It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
B. It gives preferential treatment to the weaker parts of the signal
C. For weaker signals it gives a poor ratio of signal strength to quantizing error
D. Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced.

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Question 6

In communication satellites, the up-link normally operates at a higher frequency than the down-link because it

A. gives a narrow beam shining into space
B. results in lesser signal attenuation
C. gives better beam-shaping
D. is easier to polarize a high frequency beam

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Question 7

A geosynchronous satellite

A. has the same period a that of the Earth
B. has a circular orbit
C. rotates in the equatorial plane
D. has all of the above

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Question 8

Why are techniques like frequency reuse and spatial isolation carried out?

A. Reduce traffic load
B. More gain
C. High speed
D. Error detection

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Question 9

The quality of a space-link is measured in terms of the __________ ratio.

A. C/N
B. S/N
C. G/T

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Question 10

Spatial-division multiple access (SDMA) depends on satellite location and not frequency.

A. True
B. False

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Question 11

A communication satellite is a repeater between

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

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Question 12

A certain sound has 10000 times more energy than another sound. The number of times it would sound stronger to a listener is

A. 40
B. 10000
C. 100
D. 10

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Question 13

Satellite launch sites are invariably located on Eastern seaboards to ensure that

A. launch takes place eastward
B. expenditure of propulsion fuel is reduced during plane changing
C. the satellite achieves circular orbit quickly
D. spent rocket motor and other launcher debris falls into the sea

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Question 14

The geostationary communication satellite APPLE is parked in the equatorial orbit at

A. 102° E longitude over Sumatra
B. 90° E longitude over Bangladesh
C. 74° E longitude over India
D. 67° E longitude over Pakistan

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Question 15

A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.

A. 100
B. 4
C. 1
D. 10

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Question 16

The satellite that is used as a relay to extend communication distance is called as __________

A. Relay satellites
B. Communication satellites
C. Repeater satellites
D. Geosynchronous satellites

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Question 17

Radio broadcasting is a familiar example of

A. space multiplexing
B. time multiplexing
C. frequency multiplexing
D. none of the above

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Question 18

In satellite communication, frequency modulation is used because satellite channel has

A. small bandwidth and negligible noise
B. large bandwidth and severe noise
C. maximum bandwidth and minimum noise
D. high modulation index

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Question 19

A geostationary satellite is one which

A. hangs motionless in space about 36000 km about Earth
B. travels around the Earth in 24 hours
C. remains stationary above the Earth
D. appears stationary to everybody on Earth

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Question 20

What is the maximum theoretical data rate if a transponder is used for binary transmission and has a bandwidth of 36MHz?

A. 32Mpbs
B. 72Mpbs
C. 36Mpbs
D. 12Mpbs

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Question 21

Why are VHF, UHF, and microwave signals used in satellite communication?

A. More bandwidth
B. More spectrum space
C. Are not diffracted by the ionosphere
D. Economically viable

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Question 22

In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.

A. 34 and 106
B. 52 and 88
C. 106 and 142
D. 34 and 142

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Question 23

Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?

A. Pressure of solar radiations
B. Gravitational changes due to Sun and Moon
C. Oblateness of the Earth
D. Weight of the satellite

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Question 24

Orbital disturbances of a geosynchronous satellite are caused by the

A. moon
B. sun
C. earth
D. all of the above

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Question 25

The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.

A. 0.1
B. 1
C. 2
D. 0.5

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Question 26

As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is

A. 14.85
B. 220
C. 78
D. 3.85

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Question 27

For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.

A. 27.5 to 30
B. 10 to 15
C. 30 to 50
D. 5 to 10

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Question 28

The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about

A. 10 minutes on 5 consecutive days
B. 5 minutes on 10 consecutive days
C. 30 minutes for 5 consecutive days
D. one hour for 5 consecutive days

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Question 29

The most effective anti jamming technique is

A. frequency hopping
B. spread-spectrum modulation
C. key leverage
D. once-only key

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Question 30

A transponder is a satellite equipment which

A. receives a signal from Earth station and amplifies
B. changes the frequency of the received signal
C. retransmits the received signal
D. does all of the above-mentioned functions

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Question 31

Noise temperature of Sun is more than __________ °K.

A. 1000
B. 5000
C. 100000
D. 500

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Question 32

Which of the following bands cannot be used for satellite communication?

B. Ku
C. X
D. C

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Question 33

The ending part of the popular teleserial Mahabharat will be beamed to the viewers


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Question 34

The transmitter-receiver combination in the satellite is known as a _______

A. Relay
B. Repeater
C. Transponder
D. Duplexer

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Question 35

At present, the radio-frequency band mainly used by most satellites is


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Question 36

The angle subtended by earth at geostationary communication satellite is

A. 17.34°
B. 51.4°
C. 120°
D. 60°

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Question 37

To make antenna more directional, either its size must be increased or

A. the number of its feed horns must be increased
B. the frequency of its transmission must be increased
C. its effective isotropic radiated power (EIRP) must be increased
D. its footprint must be increased

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Question 38

In a stop-and-wait ARQ system, the transmitting terminal

A. waits for positive or negative acknowled-gement from the receiving terminal after sending a block
B. sends another block if positive acknowledge is received through ACK character
C. resends the previous block if negative acknowledgement is received through a NAK character
D. does not wait for acknowledgement after sending a block

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Question 39

The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means

A. Demand-Assigned Multiple Access
B. Decibel Attenuated Microwave Access
C. Digital Analog Master Antenna
D. Dynamically-Assigned Multiple Access

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Question 40

Which technique uses two different antennas to reduce traffic on the same frequency?

A. Spatial isolation
B. Frequency reuse
C. Multiplexing
D. Modulation

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Question 41

What is the reason for carrying multiple transponders in a satellite?

A. More number of operating channel
B. Better reception
C. More gain
D. Redundancy

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Question 42

The first geostationary satellite launched in 1965 was called

B. EARLY BIRD (Intelsat-I)

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Question 43

Rotation of a geosynchronous satellite means its

A. drift from stationary position
B. wobbling
C. three-axis stabilization
D. three-dimensional stabilization

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Question 44

Which one of the following statements regarding DSI is wrong?

A. It is a digital form of TASI
B. Though it is more efficient than TASI, it is much slower
C. A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel
D. It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality

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Question 45

Which one of the following statement is correct?

A. Satellite spacing is not affected by the bandwidth of the transmitting earth station
B. Beamwidth is independent of antenna size and frequency band used
C. The width of a beam in space is inversely proportional to the width of the transmitting antenna
D. Use of high-frequency bands permits less number of satellites to share the orbit

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Question 46

The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of

A. 17.34/4.5
B. 17.34 x 4.5
C. (17.34/4.5)2
D. (17.34/4.5)4

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Question 47

For global communication, the number of satellites needed is

A. 1
B. 3
C. 10
D. 5

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Question 48

Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt.

A. 100
B. 500
C. 2000
D. 1000

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Question 49

Which technique uses spot beam antennas to divide the area covered by the satellite into smaller segments?

A. Spatial isolation
B. Frequency reuse
C. Multiplexing
D. Modulation

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Question 50

While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of

A. 2
B. 4
C. 8
D. 16

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Question 51

India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from


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Question 52

The downlink frequency is lower than the uplink frequency.

A. True
B. False

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Question 53

The number of days when Earth's shadow falls on a geosynchronous satellite is

A. 88
B. 277
C. 5
D. 10

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