Download PTU B.Tech 2020 March ECE 7th and 8th Sem DE 3.3 Satellite Communications Question Paper

FirstRanker.com

Roll No. Total No. of Pages : 02
Total No. of Questions : 09

--- Content provided by‌ FirstRanker.com ---

B.Tech.(ECE) (Sem.-8)

SATELLITE COMMUNICATIONS

Subject Code : DE-3.3 M.Code : 57551

Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :

--- Content provided by FirstRanker.com ---

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write briefly :
   1. What is the difference between active and passive satellites?

   --- Content provided by‌ FirstRanker.com ---

   2. Why the uplink and downlink frequencies are different?
   3. What is the use of control bits in the data frame?
   4. What is the need of a predictor?
   5. What are CSSB systems?
   6. What do the terms perigee and apogee mean when used to describe the orbit of a satellite orbiting the earth?

   --- Content provided by‍ FirstRanker.com ---

   7. What is Geosynchronous Satellites?
   8. Distinguish between pre-assigned and demand-assigned TDMA satellite access.
   9. Give the formulae to compute the uplink carrier to noise ratio.
   10. What is beam hopping?

--- Content provided by‌ FirstRanker.com ---

SECTION-B

2. Derive Erlang’s call congestion formula.
3. What are Kepler’s three laws of planetary motion? Give the mathematical formulation of Kepler’s third law of planetary motion.
4. Discuss in detail about the interference effects on complete link design.
5. Enumerate important applications of satellites.

--- Content provided by FirstRanker.com ---

6. Discuss in detail about the optical fibre CATV system.

SECTION-C

7. Explain different modulation techniques used for satellite communication.
8. Explain the Earth Station Subsystems.
9. How does the system noise temperature affect the performance? Derive the expression for overall system noise temperature at the receiving earth station.

--- Content provided by⁠ FirstRanker.com ---

NOTE : Disclosure of identity by writing mobile number or making passing request on any page of Answer sheet will lead to UMC case against the Student.