Satellite Communication MCQs Quiz Multiple Choice Questions & Answers

1. A synchronous satellite orbits the earth once in

1. 24 hours
2. 12 hours
3. 6 hours
4. 1 hours

2. For an elliptical orbit?

1. 0 < e < 1
2. e = 0
3. e = 1
4. None of the above

3. The velocity of a geostationary satellite is nearly

1. 1255 km/hr
2. 6757 km/hr
3. 9422 km/hr
4. 12644 km/hr

4. The optimum working frequency for satellite systems lies between

1. 20 MHz and 100 MHz
2. 2 GHz and 12 GHz
3. 20 GHz and 100 GHz
4. 100 GHz and 200 GHz

5. Geostationary satellites are located at a height of

1. 3600 km from earths surface
2. 36000 km from earths surface
3. 360,000 km from earths surface
4. 3600,000 km from earths surface

6. Calculate the radius of a circular orbit for which the period is 1 day?

1. 42.241 Km
2. 42.241 m
3. 4.241 Km
4. 2.241 Km

7. The down link frequency in the C band transponder is

1. 6 GHz
2. 4 GHz
3. 14 GHz
4. 11 GHz

8. What is an error detecting code?

1. A code which allows for the detection of errors is termed an error detecting code.
2. A code which allows for the correcting of errors is termed an error detecting code.
3. a&b.
4. None of these

9. ARQ stands for

1. Accelerated redirection facility
2. Amplitude ratiodetector quantizing noise
3. Automatic repeat request
4. Aerial range quartz crystel

10. In satellite communication modulation is used

1. AM
2. FM
3. PWM
4. PAM

11. In analog technique of modulation in satellite, the most commonly employed system is

1. AM
2. FM
3. PAM
4. PWM

12. Sound signals in TV are

1. amplitude modulated
2. dc modulated
3. frequency modulated
4. a and c

13. Video signals in TV are

1. Amplitude modulated
2. de-modulated
3. Frequency modulated
4. None of these

14. For globle communication, the minimum number of satellites needed is

1. 1
2. 3
3. 7
4. 11

15. Shannons law relates

1. Antenna gain to bandwidth
2. Frequency to antenna gain
3. Antenna gain to transmission losses
4. Information carring capacity to S/N ratio

16. Mention the different services of satellite systems.

1. Broadcasting satellite services
2. Signal transmission
3. Information transmission
4. None of the above

17. Geostationary satellite follow

1. Circular path
2. Elliptical path
3. Inclined path
4. Cycloidal path

18. Satellite used for intercontinental communications are known as

1. COMAT
2. DOMSAT
3. INTELSAT
4. EARSAT

19. DAMA stands for

1. Data accessibility master aerial
2. Digital attenuators microwave antenna
3. Dual accessibility mode antenna
4. Demand assigned multiple access

20. The carrier to noise ratio for a satellite depends upon

1. Effective Isotropic Radiated power
2. Bandwidth.
3. Free space path losses
4. All of them

21. Which area is least effectively coverd by geostationary satellites?

1. Equatorial region
2. Polar region
3. A and C
4. None of the above

22. The angle subtended by earth at a geostationary communication satellite is nearly

1. 66.5
2. 47.34
3. 17.34
4. 7.34

23. Which is the most commanly employed modulation technique in the commercial communication satellite system?

1. FM
2. Digital modulation
3. Analoge modulation
4. All of the above

24. Compander

1. Give a poor ratio of signal to duantizing error, for weaker signals
2. Give preferential treatment to stronger parts of the signal
3. Compresses the higher amplitude parts of a signal before modulation and expand them back to normal again after demodulation
4. None of the above

25. INTELSAT stands?

1. International Telecommunications Satellite
2. India Telecommunications Satellite
3. Inter Telecommunications Satellite
4. None of the above

26. Define frame efficiency.

1. It is a measure of the fraction of frame time used for the transmission of Traffic
2. It is a measure of the fraction of information time used for the transmission of Traffic.
3. a&b
4. None of above

27. With reference to satellite communication, the anti-jamming technique preferred is

1. key leverage
2. Frequency hopping
3. Once-only key
4. Frequency-spectrum modulation

28. The main advantage of satelliite comminication is

1. Low cost
2. Low distortion
3. High reliability
4. High band width

29. In TV broadcast via satellite the TV signal from the main broadcast station is routed to the earth station via

1. Low power transmitters
2. Microwave links
3. TV relay stations
4. microwave repeater stations

30. Satellite recieves signal from

1. Microwave repeater stations
2. TV relay station
3. Appropriate earth station
4. All of the above

31. A certain sound has 1000 times more eneergy then another sound. The number of times it would sound stronger to a listener will be

1. 1000
2. 100
3. 30
4. 3

32. Transmission bandwidth for satellite system least depends on

1. Modulation method
2. Overall costs
3. Available technology
4. Ionospheric characteristics

33. A communication satellite is a repeater between

1. one transmitting and one receiving station
2. one transmitting and many receiving station
3. many transmitting and one receiving station
4. many transmitting and many receiving station

34. Define Polar-orbiting Satellites.

1. Polar orbiting Satellites orbit the earth in such a way as to cover the north & south Polar Regions.
2. Orbiting Satellites orbit the earth in such a way as to cover the east & west Polar Regions
3. Either (a) & (b)
4. None of the above

35. Geostationary satellite are generally put in ....... orbit and domestic satellite in .......... orbit

1. Polar, inclined orbit
2. Polar, equatorial
3. Equatorial, polar
4. Inclined , polar

36. A television (TV) transmission is an example of which type of transmission?

1. Simplex
2. Half duplex
3. Full duplex
4. None of the above

37. What are the types of antenna losses?

1. sky noise
2. Antenna losses
3. sky noise , Antenna losses
4. all of these

38. The total noise of a satellite earth station receiving system consists of

1. Sky noise
2. Antenna and feeder noise
3. Parametric amplifier noise
4. All of the above

39. Types of CDMA?

1. Spread spectrum multiple acess
2. pulse address multiple acess
3. a&b
4. None of above

40. The multiple access technique suitable only for digital transmission is

1. TDMA
2. FDMA
3. Both (A) and (B)
4. Packet Access

41. What are the methods of multiple acess techniques?

1. TDMA
2. FDMA
3. a&b
4. None of above

42. Argument of perigee?

1. The angle from ascending node to perigee, measured in the orbital plane at the earth’s center, in the direction of satellite motion.
2. The point longest from earth
3. The point closest approach to earth
4. None of the above

43. Keplers first law states?

1. The path followed by a satellite around the primary will be an ellipse.
2. The path followed by a satellite around the primary will be an circle.
3. The path followed by a satellite around the primary will be an sphere
4. None of the above

44. Apogee?

1. The point farthest from earth
2. The point nearest from earth
3. The point smallest from earth
4. None of the above

45. Perigee?

1. The point farthest from earth
2. The point longest from earth
3. The point closest approach to earth
4. None of the above

46. Ascending node?

1. The point where the orbit crosses the equatorial plane going from south to north
2. The point longest from earth
3. The point closest approach to earth
4. None of the above

47. Define S/N ratio.

1. The S/N introduced in the preceding section is used to refer to the ratio of signal power to noise power at the receiver output.This ratio is sometimes referred to s the post detector.
2. The S/N introduced in the preceding section is used to refer to the ratio of signal power to noise power at the receiver input. This ratio is sometimes referred to as the post detector.
3. Either a or b.
4. None of above

48. Define diplexer.

1. The transmit & receives signals are separated in a device known as diplexer.
2. The transmit & receives signals are separated in a device known as diplexer
3. Either a or b.
4. None of above

49. True anomaly?

1. The true anomaly is the angle from perigee to the satellite position, measured at the earths center.
2. The point longest from earth
3. The point closest approach to earth
4. None of the above

50. As on-line, real time data transmission system is most likely to require a connection that is

1. Time shared
2. Frequency shared
3. Simplex
4. Duplex