Radar Engineering and Satellite Communication MCQs

Question 1

One of the following satellite systems is used for intercontinental communications

Accepted Answer

INTELSAT

Answer

DOM SAT

Answer

MARISAT

Answer

TIROS-N

Question 2

One of the following satellite systms is being used for weather forecast applications

Accepted Answer

TIROS-N

Answer

COMSAT

Answer

GORIZONT

Answer

SPOT

Question 3

One of the following satellite systems is not used for communication services

Accepted Answer

LANDSAT

Answer

GORIZONT

Answer

EKRAN

Answer

INSAT

Question 4

Referring to satellite communication systems, a refraction that occurs in the ionosphere due to presence of earth's magnetic field and gives rise to rotation of plane of polarisation of a linearily polarised wave is known as

Accepted Answer

Faraday rotation

Answer

Scintillation

Answer

Doppler shift

Answer

Depolarisation

Question 5

A 10 GHz signal was beamed, up at a satellite at a distance of about 40,000 kms from earth's surface, The signal undergoes a free space loss of about

Accepted Answer

385 dB

Answer

10 dB

Answer

50 dB

Answer

200 dB

Question 6

A geosynchronous orbit is the one when the

Accepted Answer

the satellite's orbital velocity is in synchronism with the earth's rotation

Answer

satellite is placed in orbit 15,000 miles about earth's surface in a north to south orbital path '

Answer

the satellite is placed in orbit 22,000 miles above earth's surface in an orbit that matches one of the longitudinal lines of earth

Answer

The satellite is placed 35,000 miles above earth's surfacein equatorial orbit

Question 7

If a satellite is in a geosynchronous orbit, it

Accepted Answer

both (a) and (c)

Answer

remains in a fixed position relative to points on earth

Answer

moves faster than the earth's rotation so as to sweep a large portion of earth's surface in a 24 hour period

Answer

can cover 40 percent of earth's surface

Question 8

Higher the frequency of satellite or earth station transmitter,

Accepted Answer

all of above

Answer

higher is the potential bandwidth that can be used for communications

Answer

closer the satellites can be spaced without interfering with each other

Answer

narrower is the radiation beamwidth for a given earth station and satellite antenna diameter

Question 9

Satellite capacity depends on

Accepted Answer

none of the above

Answer

weight that can be placed in orbit

Answer

panel area available for energydissipation transmitter power

Answer

all of above