M.C.A. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Part III OPERATING SYSTEMS
2 90223-AA
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Explain about main frame and desktop systems.
2. Describe the different classification of system calls.
3. Write notes on co-operating processes.
4. Explain about Round robin scheduling algorithm with suitable example.
5. What is process control block? Describe various components of PCB.
6. Explain the classic problems of synchronization.
7. What is the cause of thrashing? How it occurs and explain different methods to
prevent from thrashing?
8. What is directory? Explain about directory structure.
SECTION — B
Answer ALL questions. 10 40 Marks)
UNIT — I
9. Briefly describe how the computer system organization and major operating system
components are used in a variety of computing environments.
Or
10. Explain about storage structure and storage hierarchy.
UNIT — II
11. What is multithreading? Discuss threading issues in Solaries, Windows 2000 and
Linux.
Or
12. Explain naming and synchronization issues in inter process communication.

UNIT — III
13. Explain in detail how semaphores and monitors are used to solve producerconsumer
problem.
Or
14. State and explain the dining philosopher's problem and how allocate the several
resources among several processes in a deadlock and starvation free manner.
UNIT — IV
15. Compute page fault ratio. The pages referenced are 5 and 7
(12 pages). The job is allowed 3 blocks. Compare LRU and FIFO page replacement
schemes.
Or
16. Explain the indexed and linked file allocation methods. Discuss the advantages
and disadvantages in those methods.
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