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Kuvempu University 2011-1st Sem B.E Electronics & Communication Engineering V (E & C) - Question Paper

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VI Semester B.E.(E&C)Examination,June/July2011

(CBCS Scheme)


Time:3 Hours Max.Marks:100

Instruction:Answer any FIVE FULL questions choosing atleast one from each part.



1.a)Define operating system.Explain briefly the benefits of operating system. 5

b)Explain different services of operating system.Also mention their system calls. 10

c)Explain briefly the concept of Booting. 5

2.a)Explain in detail file system of information management. 10

b)Explain briefly the following 10

i)Device drive

ii)Terminal I/O


3. A)What is a process?Explain the concept of context of switching. 10

b)Explain the following: 10

i)Create a process

ii)Process control block

4.a)Explain process state transition diagram. 8

b)Explain in detail producer-consumer problems of inter process communication. 12



5.a)Explain graphical representation of dead lock. 8

b)Explain single contiguous memory management. 8

c)List the dead lock prerequisites and stratagies. 4

6.a)Explain paging concept of memory management. 10

b)Explain virtual memory management system. 10


7.a)Explain the following:

i)File system organization 7

ii)File protection 6

iii)Dynamic protection structures 7

8.a)Explain the following:

i)Revocation 4

ii)Protection problem 4

iii)Security 4

b)Explain briefly goals of protection 8


9.a)Define UNIX operating system.Explain briefly history and design principles of UNIX. 12

b)Explain the concept of programmer interface. 8

10.a)Explain the following w.r.t. UNIX OS:

i)Process management 7

ii)Memory management 7

iii)File system 6



VI Semester B.E.(E&C)Examination,June/July2011

(CBCS Scheme)


Time:3 Hours Max.Marks:100

Instruction:Answer any FIVE FULL questions choosing atleast one from each part.


1.a)Write a note on microphone with neat diagram.(6)

b)Mention the functions of switching system.(6)

c)Explain electronics switching in detail.(8)

2.a)Mention the advantages and disadvantages of crossbar switch.(6)

b)Explain the working of distribution frames in Strowger exchange.(8)

c)Explain circuit switching and message switching.(6)


2.a) i)Define traffic intensity

ii)On average,during the busy hour,a company makes 120 outgoing calls of average duration 2min.It receivers 200 incoming calls of average duration 3min.Find the outgoing traffic and incoming traffic.(4)

b)Derive first Erlang distribution.(10)

c)Write a brief note on Congestion.(6)

4.a)Derive Second Erlang Distribution.(10)

b)Derive Erlang Delay Formula(6)

c)A group of 20 trunks provides a GOS of 0.01 when offered 12E of traffic.

i)How much is the GOS improved if one extra trunk is added to the group?

ii)How much does the GOS deteriorate if one trunk is out of service? (4)


5.a)What is grading?Describe various types of Grading.(5)

b)Design 2 stage network to connect 12 incoming trunks to 9 outgoing trunks and arrive at optimum solution.(8)

c)Deduce the 2 number of cross points to three stage switching network with N incoming and M outgoing trunks.(7)

6.a)Derive an expression for GOS of link system for four stage networks.(8)

b)Explain traffic capacity of Gradings.(6)

c)Design 3 stage network for 100 incoming trunks to 100 outgoing trunks.(6)


7.a)Explain time space switch with suitable diagram.(6)

b)Explain Frame alignment.(6)

c)A T-S-T network has 20 incoming and 20 outgoing PCM highways,each conveying30 channels.The required GOS is 0.01.Find the traffic capacity of the network if

i)Connection is required to the particular free channel on a selected outgoing trunk i.e.mode 1.

ii)Connection is required to a particular outgoing highway but any free channel may be used i.e.mode 2.(8)

8.a)With a neat sketch explain a space switch for K incoming PCM highways and M outgoing PCM highways(8).

b)Explain traffic double ended unilateral and bilateral synchronization systems.(6)

c)Write a note on concentrators.(6)


9.a)Explain call processing functions.(10)

b)Explain briefly processor architecture of Stored Program control.(5)

c)With a neat diagram explain basic symbols used to draw the state transition diagrams.(5)

10.a)Explain outband signaling in context with FDM carrier systems.(6)

b)Write a note on PCM signaling.(6)

c)Explain with neat diagram Audio Frequency junctions and trunk circuits.(8)








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