CLASS: B.S. ELECTRONICS
14A/ 206
St. JOSEPH’S COLLEGE (AUTONOMOUS) TIRUCHIRAPPALLI – 620 002
SEMESTER EXAMINATIONS – APRIL 2014
TIME: 3 Hrs.
MAXIMUM MARKS: 100
SEM
SET
PAPER CODE
TITLE OF THE PAPER
VIII
2010
10UEL80221
SATELLITE AND MOBILE
COMMUNICATION
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the correct answer:
1. The angle between the orbital plane and the earth’s equatorial plane
is known as _______.
a) apogee
b) perigee
c) Inclination
d) Progrode orbit
2. In VAST remote terminal consists of a dish antenna and it has the
diameter of _______.
a) 0.6 to 3.8m
b) 0.3 to 0.2m
c) 0.1m
d) 0.5m
3. All the earth stations are _______ connected through the common
signaling channel.
a) rarely
b) permanently
c) temporary
d) none of the above
4. Each cellular base station is allocated a group of radio channels to
be used within a small geographic area is called as _______.
a) cell
b) set up time
c) blocked call
d) none of the above
5. The GSM architecture consists of _______ major interconnected
subsystem.
a) 10
b) 3
c) 5
d) 7
Fill in the blanks:
6.
The Anamolic period PA is _______.
7.
_______ is used to detect the rim of the earth against the
background of space.
8.
The time interval from the start of one reference burst to the next
is called as _______.
9.
_______ increases the capacity of a cellular system since it
increases the number of times that channels are reused.
10. _______ is a system that connects subscribers to the local
telephone system wirelessly.
State True or False:
11. Elevation is the angle measured upward from the horizontal plane
to the path.
12. Tracking is the function of determining the current orbit and
position of the space craft.
13. Both FDMA and TDMA can be operated as pre-assigned or
demand assigned systems.
14. Interference is the miner limiting factor in the performance of
cellular radio systems.
15. The output of the deviation limiter is filtered using a post deviation
limiter.
Match the following:
16. Transmitter
17. Tracking
- a) 500m
- b) Frequency reuse
18. CDMA
- c) Microwaves
19. Sector
20. PACS
- d) Code signal
- e) space craft
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Differentiate between Active and passive satellite.
OR
b. State and explain Kepler’s law.
22. a. Explain the satellite power supply system.
OR
b. With necessary block diagram, explain the concept of earth
station.
23. a. Describe the function of spread spectrum technique.
OR
b. Write a brief note on “Basic CDMA system”.
24. a. Write a short note on “Frequency reuse”.
OR
b. Describe the functions of “Handoff strategies”.
25. a. Write a brief note on “AMPS voice modulation process”.
OR
b. List any four differences between Bluetooth and Zigbee.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. a. Write down the types of orbit.
b. Explain the following terms.
(i) Orbital perturbation
(ii) Look angles and slant range
27. Explain the following VSAT with neat block diagram.
(i) Remote terminal
(ii) HUB station
28. Explain the Multiple access techniques of FDMA and TDMA.
29. a. Explain the following terms.
(i) set up time (ii) blocked call (iii) Holding time
(iv) Traffic intensity (v) Grade of service (GOC)
b. Solve the problem by using given values.
Au = 1000; u = 6; c = 8
(i)
Find total traffic intensity (A)
(ii) Traffic intensity per channel (Ac)
30. a. Write a brief note on “Wireless in Local Loop”.
b. With neat block diagram, explain the architecture of PACS.
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