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Satellite Communication

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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

For global communication, the number of satellites needed is

A

1

B

3

C

10

D

5

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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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

A

WESTAT

B

INSAT-IC

C

ARABSAT

D

INSAT-ID

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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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

A

EHF

B

UHF

C

VHF

D

SHF

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Satellite Communication
2 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

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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