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

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ECE (Electronics And Communications Engineering) 2020 March 7th and 8th Sem DE 3.3 Satellite Communications Previous Question Paper

1 | M-57551 (S2)-2774
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ECE) (Sem.?8)
SATELLITE COMMUNICATIONS
Subject Code : DE-3.3
M.Code : 57551
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
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 :
a) What is the difference between active and passive satellites?
b) Why the uplink and downlink frequencies are different?
c) What is the use of control bits in the data frame?
d) What is the need of a predictor?
e) What are CSSB systems?
f) What do the terms perigee and apogee mean when used to describe the orbit of a
satellite orbiting the earth?
g) What is Geosynchronous Satellites?
h) Distinguish between pre-assigned and demand-assigned TDMA satellite access.
i) Give the formulae to compute the uplink carrier to noise ratio.
j) What is beam hopping?
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1 | M-57551 (S2)-2774
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ECE) (Sem.?8)
SATELLITE COMMUNICATIONS
Subject Code : DE-3.3
M.Code : 57551
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
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 :
a) What is the difference between active and passive satellites?
b) Why the uplink and downlink frequencies are different?
c) What is the use of control bits in the data frame?
d) What is the need of a predictor?
e) What are CSSB systems?
f) What do the terms perigee and apogee mean when used to describe the orbit of a
satellite orbiting the earth?
g) What is Geosynchronous Satellites?
h) Distinguish between pre-assigned and demand-assigned TDMA satellite access.
i) Give the formulae to compute the uplink carrier to noise ratio.
j) What is beam hopping?

2 | M-57551 (S2)-2774
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.
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.









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.


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