Download dtet5 - advance communication systems

Time : 3 hrs
DTET5 - ADVANCE COMMUNICATION SYSTEMS
Maximum marks : 75
Instruction:
1.
Question paper is divided into Group A, Group B and Group C
2.
Each Group is 25 Marks
3.
Figure to the right in bracket indicates marks.
4.
Good Handwriting is expected
5.
Assume suitable data if necessary.
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
Q.1.
Compare the A scope and PPI radar, and displays, by stating advantages and
application of each
(05)
Q.2.
Q.3.
Q.4.
Q.5.
What is different type of Fiber Optics Cable?
(10)
Draw the block diagram of basic radar set and explain its essential operation
(10)
What do you understand by ‘Pulse Modulation’? Mention its types and advantages (10)
What is computer communication ? Explain different ways of computer communication ?
How LAN works
(10)
Group B (25 Marks)
Answer any three questions (Questions 6 is compulsory)
Q.6. Explain V groove structure fiber optic cable?
(05)
Q.7. With the help of neat figure explain Quantization Process?
(10)
Q.8. What is Pulse code modulation and what are its advantages?
(10)
Q.9. Draw the block diagram of an FMCW radar and explain the function of each block(10).
Q.10. Explain the principle and working of cellular telephones
(10)
Group C (25 Marks)
All Questions are Compulsory.
Q.11
i)
ii)
iii)
iv)
v)
i)
ii)
(A) Fill in the blanks ( each question carry 2 marks)
In cellular phones _________ way speech communication is possible
_________ machine is a combination of copier / Scanners telephone system and printer.
Error signals generated form the sensors are fed to a _________ encoder block
For radiation of electromagnetic waves _________ are used
Thousands of minute ___________ are placed on the surface of satellite
(B) Multiple choice Question (Each question carries 2 marks)
A duplexer is a circuit designed to use a single antenna for
(a) transmission
(b) reception
(c) matching
(d) both (a) and (b) are correct
The LOS microwave systems are used to carry the signals of
(a) telephony
(b) television
(c) data
(d) all the above are correct
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iii)
(iv)
(v)
i)
ii)
iii)
iv)
v)
One of the following is not a communication system.
(a) Radar
(b) Teleprinter
(c) VCD Player
(d) Fax
A voice pager provides the following.
(a) Voice Mail
(c) Call forwarding
(b) News Bulletin
(d) All the above are correct
An optical fiber is quite similar in appearance to the
(a) coaxial cable system
(b) waveguide system
(c) twin-wire system
(d) parallel feeders
(C) True or false (each question carry 1 marks).
Cell is known as Local area networks
For radiation of electromagnetic waves photons are used
Surface waves progress along the surface of the earth
Main ingredient in glass is sand
Glass will break when imposed to neutron bombardment
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