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- Question
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
- Correct Answer
- it is resistant to the effects of noise
- 1. Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h.
Options- A. 11200
- B. 0
- C. 36000
- D. 22800 Discuss
- 2. India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.
Options- A. geostationary
- B. equatorial
- C. polar
- D. sun-synchronous polar Discuss
- 3. In satellite communication, highly directional antennas are used to
Options- A. direct the spot beam to a particular region of space on Earth
- B. strengthen the beam to overcome the cosmic noise
- C. make corrections in change of polarisation of the beam
- D. select a particular channel in transmission and reception Discuss
- 4. The expression for satellite link frequencies such as 4/6 GHz denotes that
Options- A. 4 GHz is the up-link and 6 GHz is the down-link frequency
- B. 4 GHz is the down-link and 6 GHz is the up-link frequency
- C. the system operates at a mean frequency of 5 GHz
- D. one frequency is used as a back up for the other Discuss
- 5. Most of the communication satellites are stationed to the West of their service areas in order to reduce their
Options- A. eclipse period
- B. loss of power
- C. battery power provision
- D. mass of station-keeping fuel Discuss
- 6. When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.
Options- A. 273
- B. 243
- C. 170
- D. 123 Discuss
- 7. 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 Discuss
- 8. 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 Discuss
- 9. Master control facility (MCF) for INSAT-2 series satellites is located at
Options- A. Madras
- B. New Delhi
- C. Leh
- D. Hassan Discuss
- 10. 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 Discuss
Satellite Communication problems
Search Results
Correct Answer: 11200
Correct Answer: sun-synchronous polar
Correct Answer: direct the spot beam to a particular region of space on Earth
Correct Answer: 4 GHz is the down-link and 6 GHz is the up-link frequency
Correct Answer: battery power provision
Correct Answer: 123
Correct Answer: Building launching rocket Ariane for putting APPLE in orbit
Correct Answer: Kourou in French Guyana
Correct Answer: Hassan
Correct Answer: 540
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