MIDTERM EXAMINATION
Spring 2010
CS601- Data Communication
Time: 60 min
Marks: 40
Question No: 1 ( Marks: 1 ) - Please choose one
► Mesh
► Star
► Bus
► Ring
Question No: 2 ( Marks: 1 ) - Please choose one
► 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 )
Question No: 23 ( Marks: 3 )
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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