A telephone user while talking to a person via a satellite has to wait for reply

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Question
A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.
Options
A. 100
B. 270
C. 470
D. 540

Correct Answer

540

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2. APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from
Options
A. Cape Canaveral in Florida
B. Kourou in French Guyana
C. Canarvon in Western Australia
D. Bangalore in South India

3. Point out the false statement.
Launching of geostationary experimental communication satellite has helped India to gain experience in
Options
A. Building, for the time, a body-stabilized geosynchronous communication satellite with its own apogee propulsion and control systems
B. Attitude control and station management operations for a geostationary satellite
C. Building launching rocket Ariane for putting APPLE in orbit
D. Domestic communications on an experimental basis

5. Phase modulation is commonly-used for data transmission mainly because
Options
A. phase can be varied from + 180� to 180�
B. it is resistant to the effects of noise
C. demodulation is very easy
D. it gives highest data rates that can be transmitted over a given channel

6. In the context of error detection in satellite transmission, ARQ stands for
Options
A. Automatic Repeat Request
B. Automatic Relay Request
C. Accelerated Recovery Request
D. Automatic Radiation Quenching

8. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it
Options
A. offers a much wider available bandwidth
B. does not suffer from atmospheric at tenuation
C. permits the use of smaller antenna
D. does not suffer from rain attenuation

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