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# Previous Year Exam Questions for Satellite Communication System - SCS of 2014 - HITECH by Narayan Sethy

• Satellite Communication System - SCS
• 2014
• PYQ
• ANNA UNIVERISTY - HITECH
• Electronics and Communication Engineering
• B.Tech
• 55 Views
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#### Previous Year Exam Questions for Satellite Communication System - SCS of 2014 - HITECH by Narayan Sethy / 3

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Roll No. B.E / B.Tech ( Full Time ) D E G R E E END S E M E S T E R EXAMINATIONS, APRIL / MAY 2014 DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING Eighth Semester E C 9031 S A T E L L I T E COMMUNICATION (Regulation R-2008) Time: 3 Hours Answer ALL Questions Max. Marks 100 PART-A (10 x 2 = 20 Marks) 1. State Kepler's second law of planetary motion. 2. The earth rotates once per sidereal day of 23 hours 56 min 4.409 s. Show that the radius of the GEO is 42,164.17 km. u=3.9 x 1 0 k m / s ' 5 3 2 3. What is meant by input back off of a transponder? 4. An uplink operates at 14 GHz, and the flux density required t o saturate the transponder is 120dB (W/m2). The free space loss is 207 dB, and the other propagation losses amount to 2 db. Calculate the earth-station [EIRP] required for saturation, assuming clear-sky conditions. Assume {RFL} is negligible. 5. A satellite is operated at an EIRP of 64 dBW with an output BO of 7 dB. The transmitter feeder losses amount to 4 dB and the antenna gain is 60 dB. Calculate the power output of the TWTA required for full saturated EIRP. 6. What is polarization interleaving? 7. Distinguish between DAMA and PAMA. 8. What are the limitations of FDMA-satellite access? 9. What is dilution of precision? 10. Define remote sensing. How does a satellite find its use in Remote Sensing? PART-A (5 x16 = 80 Marks) 11.(i) Define look angle, Azimuthal angle and elevation angle and determine elevation angle calculation with necessary diagrams (8) (ii) The space shuttle is an example of a low earth orbit satellite. It orbits at an altitude of 250km above the earth's surface. The earth's radius is 6371.14 km. Calculate the period of shuttle orbit at an altitude of 250km and orbit is circular. Find also the linear velocity of the shuttle. (4) (iii) A satellite is in elliptical orbit with a perigee of 1200km and an apogee of 3800. The man earth radius is 6378.14km.Find the period in hours, minutes and seconds. (4)