Mobile Satellite Communications M.Tech Question Paper : vardhaman.org

College : Vardhaman College Of Engineering
Degree : M.Tech
Semester : I
Department : Digital Electronics and Communication Systems
Subject : Mobile Satellite Communications
Document type : Question Paper
Website : vardhaman.org

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February – 2014 :https://www.pdfquestion.in/uploads/vardhaman.org/6417-MT1R13FEB-14.pdf

Mobile Satellite Communications Question Paper :

Two Year M. Tech I Semester Regular Examinations April – 2013
(Common to Digital Electronics and Communication Systems & Wireless and Mobile
Communications )
Time: 3 hours
Max Marks: 60
Answer any FIVE Questions.
All Questions carry equal marks

Related / Similar Question Paper : Vardhaman M.Tech Power Semiconductor Devices Question Paper

All parts of the questions must be answered in one place only :
1. a) Define
i. Look angle
ii. Subsatellite points
iii. Orbit
iv. Uplink design
v. Argument of perigee 4M
b) Explain the main elements of satellite communication networks with neat block diagram. 4M
c) Briefly explain about Geo stationary satellite systems. 4M

2. a) What is Doppler effect? Show that . 4M
b) What is meant by eclipse on satellites? Discuss eclipse geometry dates and duration of eclipses. 5M
c) What is sun-transit outage? 3M

3. a) Explain about considerations in inclined orbit constellations, hybrid constellations. 6M
b) Discuss the optimization technique to ensure minimum elevation angle within coverage area. 6M
4. a) Briefly explain various frequency bands used for satellite communications and frequency allocations for mobile satellite service. 7M
b) Explain spectrum forecast methodology. 5M
5. a) With neat block diagram, explain the main entities of a large earth station. 6M
b) Write short notes on
(i) Vehicle mounted terminal
(ii) Mobile terminal antennas 6M
6. a) Explain the effect of orbital altitude on spacecraft design. Derive C/N at spacecraft from user transmission. 8M
b) Explain inter satellite links. 4M

7. a) Explain Big LEO systems. 8M
b) Compare LEO systems with MEO systems. 4M
8. a) Describe how an MSAT network operates at both L-band and Ku-band. 8M
b) Consider an un shadowed mobile satellite path operating with a K=5dB. Calculate the percent of time the signal amplitude will fade below 6dB. 4M

M. Tech I Semester Regular Examinations, February – 2014
(Regulations: VCE-R11)
MOBILE SATELLITE COMMUNICATIONS
(Common to Digital Electronics and Communication Systems &
Wireless and Mobile Communications)
Date : 12 February, 2014 Time : 3 Hours
Answer any FIVE Questions.
All Questions carry equal marks

All parts of the questions must be answered in one place only :
1. a) With a block diagram explain modern mobile satellite system. 8M
b) Give the comparison of main characteristics of mobile services through terrestrial and satellite media. 4M
2. a) Describe the effect of eclipse on satellites. 8M
b) Write a short note on orbital debris. 4M

3. a) With relevant diagram, explain about polar constellation. 8M
b) What are the assumptions made in the performance analysis of a few LEO and MEO systems in a hypothetical urban environment. 4M
4. List and define the components that are used in the simulation model for interference analysis. 12M

5. a) With a block diagram explain the entities of a large earth station. 8M
b) Briefly describe the various antennas used for MSS terminal and tracking system. 4M
6. a) What are the advantages and disadvantages of regenerative transponders? 6M
b) xplain inter satellite links. 6M

7.a) With a block diagram explain American mobile satellite corporation system. 8M
b) Write a short note on Big LEO system. 4M
8. With a block diagram of MSAT, describe how an MSAT network operates at both L-band and Ku-band. 12M

Object Oriented Analysis And Design :
(Software Engineering)
Date : 05 February, 2014
Time : 3 Hours
Max. Marks : 60
Answer any FIVE Questions.
All Questions carry equal marks

All parts of the question must be answered in one place only :
1. a) Describe object identity, encapsulation and polymorphism. 6M
b) List the common mechanisms that can be applied for Unified Modeling Language (UML). Explain any two. 6M

2. a) Describe dependency and generalization with an example. 6M
b) Prepare a class diagram for a graphical document editor that supports grouping. Assume that a document consists of several sheets. Each sheet contains drawing objects, including text, geometrical objects and groups. A group is simply a set of drawing objects, possibly including other groups. A group must contain at least two drawing objects. A drawing object can be a direct member of at most one group. Geometrical objects include circles, ellipses, rectangles, lines and squares. 6M

3. a) Explain sequence diagram and collaboration diagram with an example. Discuss the situations when to use each of them. 8M
b) Give a visual representation to show the different types of messages in a sequence diagram. 4M

4. a) Define action state and activity state. Illustrate with an example the object flow in an activity diagram 7M
b) Consider software for a Library System. In addition to the normal activities, it supports to reserve a book in an external library, if it is not available in the local library. Draw a use case diagram. 5M

5. a) Explain the ways in which the relationship between components and its interfaces can be established. 6M
b) Give the guidelines to model a client server system. Illustrate with an example. 6M
6. a) Define the 4 Ps in software development. 4M
b) Explain the steps that are to be followed while creating software architecture. 8M

7. a) Explain how the core work flows will be carried out during the construction phase. 8M
b) Explain the activities involved during the initial stage of elaboration phase. 4M
8. a) Explain the activities that are to be carried out during transition phase. 8M
b) Describe the archetypal construction iteration workflow. 4M