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Posted By: S.Yamini Member Level: Diamond Posted Date: 05 May 2008
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2007 Indira Gandhi National Open University (IGNOU) M.C.A Operating Systems Question paper
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Term-End Examination
MCS41 : Operating Systems
Time: 3 hours
Maximum Marks: 100
(Weightage 75%)
Note : Question number 1 is compulsory. Answer any three questions from the rest.
June 2007
1. (a) Calculate the average turn around time, average waiting time, throughput and processor utilization for the following set of processes: (10)
Process Processing time
P1 20
P2 1
P3 10
P4 5
Assume that the quantum is 3. Use Round Robin Scheduling Policy. Draw the Gantt chart also.
(b) What is a Resource allocation graph? How can you conclude from the Resource allocation graph that the process are in a state of deadlock? Explain with an example. (10)
(c) Explain the Bell and LaPadula model. Also, explain the two properties of Biba integrity model. (10)
(d) Write and explain the Dekker's solution for mutual exclusion. (10)
2. (a) Explain the file system management in Windows 2000. (10)
(b) Explain the principles of operation of demand segmentation (10)
3. (a) Define the term "Directory". Explain any two schemes of logical directory structures. (10)
(b) How does UNIX manage the processes? Explain. (10)
4. (a) List various application madels for writing distributed programs and explain any one of them. (10)
(b) Explaint he two methods of allocating the disk space. (10)
5. (a) Draw and explain the flow of activity that takes place during a remote procedure call (RPC) between two networked systems. (10)
(b) What is a page-fault ? List all the steps of how a page-fault is serviced by the operating system. (10)
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