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Friday, December 3, 2010

Complete Solved Midterm CS601- Data Communication

MIDTERM  EXAMINATION
Spring 2010
CS601- Data Communication
Time: 60 min
Marks: 40

Question No: 1      ( Marks: 1 ) - Please choose one
 Which topology requires a central controller or hub?

       Mesh

       Star

       Bus

       Ring




Question No: 2      ( Marks: 1 ) - Please choose one
 Unidirectional traffic movement is overcome by dual ring technology.

       True

       False






Question No: 3      ( Marks: 1 ) - Please choose one


Which one best describes the given statement:

"To allow multiple users to share total capacity of a transmission medium"

       congestion control

       exchange management

       multiplexing



Question No: 4      ( Marks: 1 ) - Please choose one


Which one is not among standard creation committee.


       internet society and IETF

       ITU-T

        IEEE



Question No: 5      ( Marks: 1 ) - Please choose one


Set of rules that govern communication is called

       OSI model

       Protocol

       TCP/IP model

       Datagram




Question No: 6      ( Marks: 1 ) - Please choose one

Frequency of a failure and network recovery time after a failure are measures of the ____________ of a network.

       Performance

       Reliability

       Security

       Feasibility



Question No: 7      ( Marks: 1 ) - Please choose one

3dB is also called as power bandwidth.

       True

       False




Question No: 8      ( Marks: 1 ) - Please choose one

ASK, PSK, FSK and QAM are examples of ____________ modulation.

       digital-to-digital

       digital-to-analog

       analog-to-analog

       analog-to-digital




Question No: 9      ( Marks: 1 ) - Please choose one


Packet switching is a connection oriented service.

       True

       False



Question No: 10      ( Marks: 1 ) - Please choose one


Data synchronization is a function related with ___________

       session layer

       presentation layer

       transport



Question No: 11      ( Marks: 1 ) - Please choose one


Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals

       True

       False



Question No: 12      ( Marks: 1 ) - Please choose one

The internet model consists of _________ layers.

       three

       two

       five

       seven




Question No: 13      ( Marks: 1 ) - Please choose one


Analog to digital conversion is also termed as modulating an analog signal.

       True

       False



Question No: 14      ( Marks: 1 ) - Please choose one


PCM is the first process of PAM.

       True

       False



Question No: 15      ( Marks: 1 ) - Please choose one


A modulator converts a(n) ____________ signal to a(n) ____________ signal.

       FSK: PSK

       Digital: analog

       Analog: digital

       PSK: FSK



Question No: 16      ( Marks: 1 ) - Please choose one


The _______________ layer changes bits into electromagnetic signals.

       physical

       data link

       transport

       none of given



Question No: 17      ( Marks: 1 ) - Please choose one


We need ____________ to decompose a composite signal into its components.

       fourier transform

       nyquist theorem

       shannon capacity




Question No: 18      ( Marks: 1 ) - Please choose one


The bit rate always equals the baud rate in which type of signal?

       FSK

       QAM

       4-PSK

       PSK



Question No: 19      ( Marks: 1 ) - Please choose one

There are _____possible variations of 16 QAM.

       five

       two

       three

       four



Question No: 20      ( Marks: 1 ) - Please choose one

Number of signal units per second that are required to represent a bit is called bit rate.

       True

       False




Question No: 21      ( Marks: 2 )


Write down three characteristics of Sine Wave.



Question No: 22      ( Marks: 2 )
 A Sine wave has a frequency of 6 Hz. What is its period?




Question No: 23      ( Marks: 3 )
 Give similarities between 4 QAM  & 8 QAM.

Question No: 24      ( Marks: 3 )


What is digital signal? Give an example


Question No: 25      ( Marks: 5 )

Difference between  Phase Modulation(PM) with Frequency Modulation(FM)?



Question No: 26      ( Marks: 5 )

Write down the criteria or technique that we follow for assigning integral values to sampled signals and also its conversion into binary format. Explain it?


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