Exam Details
| Subject | data communications | |
| Paper | ||
| Exam / Course | electronics and communication engineering | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS)
B. Tech VI Semester Regular Examinations, May 2018
(Regulations: VCE-R15)
DATA COMMUNICATIONS
(Electronics and Communication Engineering)
Date: 24 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Give the comparison among serial and parallel digital data transmission methos.
7M
Briefly discuss different types of noise in data communication signals and calculate SNR and SNR dB of a circuit with a signal power of 10W and a thermal noise power of 0.01W.
8M
2.
Define the term data communication and explain different modes of transmission for data communications circuits.
7M
Briefly discuss Hartley's law and Shannon limit of information capacity.
8M
Unit II
3.
What are transverse electromagnetic waves and explain the characteristics of Electromagnetic waves.
8M
Explain different components of a basic coaxial cable with the help of diagram.
7M
4.
Explain different categories of standard grades of UTP cable defined by EIA.
6M
Briefly discuss the advantages and disadvantages of Optical Fiber Cables.
9M
Unit III
5.
With a neat block diagram explain the different process involved in pulse code modulation.
7M
Compare delta modulation and differential PCM.
8M
6.
Define multiplexing. Compare TDM and FDM.
7M
For a bit pattern 1011010110 sketch the following line codes:
i. Unipolar encoding
ii. Polar encoding NRZ-L
iii. Manchester encoding
8M
Unit IV
7.
What is bar code, and when it is commonly used? Describe what is meant by discrete bar code, continous bar code.
7M
Explain Error control in Data communication.
8M
8.
What is Redundancy checking? Explain any three types of redundancy check.
7M
Discuss on synchronous and Asynchronous data link protocols.
8M
Unit V
9.
List and briefly describe the basic blocks of a voice-band modem.
8M
Explain the functionalities of RJ connectors and TRS connectors in a telephone set.
7M
10.
Explain different categories of a telephone signalling.
8M
What is modem synchronization? list the functions of modem synchronization.
7M
(AUTONOMOUS)
B. Tech VI Semester Regular Examinations, May 2018
(Regulations: VCE-R15)
DATA COMMUNICATIONS
(Electronics and Communication Engineering)
Date: 24 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Give the comparison among serial and parallel digital data transmission methos.
7M
Briefly discuss different types of noise in data communication signals and calculate SNR and SNR dB of a circuit with a signal power of 10W and a thermal noise power of 0.01W.
8M
2.
Define the term data communication and explain different modes of transmission for data communications circuits.
7M
Briefly discuss Hartley's law and Shannon limit of information capacity.
8M
Unit II
3.
What are transverse electromagnetic waves and explain the characteristics of Electromagnetic waves.
8M
Explain different components of a basic coaxial cable with the help of diagram.
7M
4.
Explain different categories of standard grades of UTP cable defined by EIA.
6M
Briefly discuss the advantages and disadvantages of Optical Fiber Cables.
9M
Unit III
5.
With a neat block diagram explain the different process involved in pulse code modulation.
7M
Compare delta modulation and differential PCM.
8M
6.
Define multiplexing. Compare TDM and FDM.
7M
For a bit pattern 1011010110 sketch the following line codes:
i. Unipolar encoding
ii. Polar encoding NRZ-L
iii. Manchester encoding
8M
Unit IV
7.
What is bar code, and when it is commonly used? Describe what is meant by discrete bar code, continous bar code.
7M
Explain Error control in Data communication.
8M
8.
What is Redundancy checking? Explain any three types of redundancy check.
7M
Discuss on synchronous and Asynchronous data link protocols.
8M
Unit V
9.
List and briefly describe the basic blocks of a voice-band modem.
8M
Explain the functionalities of RJ connectors and TRS connectors in a telephone set.
7M
10.
Explain different categories of a telephone signalling.
8M
What is modem synchronization? list the functions of modem synchronization.
7M
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