CS 2254 operating System question paper download

CS2254 - OPERATING SYSTEMS

(Common to Information Technology)
(Regulation 2008)
Time: Three hours Maximum: 100 Marks
Answer ALL Questions

PART A - (10 × 2 = 20 Marks)

1.Mention the Objectives and functions of an operating system.
2.Define a thread. Differentiate user threads from kernel threads.
3. What is a semaphore? State the two parameters.
4. What is deadlock? What are the schemes used in the operating system to handle
deadlocks?
5. Differentiate a page from a segment.
6. What is meant by thrashing? Give an example.
7.Mention Objective of the file management system.
8.Differentiate the Various File Access Methods.
9.What is the need for disk scheduling?
10. What does swap-space management mean?

PART B - (5 × 16 = 80 Marks)
11th (A) (i) Explain the operating system structure and its components. (Marks 8)
(Ii) Explain Briefly IPC in Linux. (Marks 8)
Or
(B) (i) Explain Process Control Block. (Marks 4)
(Ii) Describe the Differences among short-term, medium-term, and
long-term scheduling. (Marks 4)
(Iii) Describe the Inter Process Communication in client-server systems.
(8)

12th (A) (i) Distinguish Between preemptive and non-preemptive scheduling.
Each type Explain with an example. (Marks 8)
(Ii) What is synchronization? Explain how semaphores can be used to
deal with n-process critical section problem. (Marks 8)
Or
(B) (i) Discuss the issues in multiprocessor and real-time scheduling. (Marks 8)

(Ii) Explain Banker's deadlock-Avoidance algorithm with an
illustration. (Marks 8)

13th (A) (i) Discuss how memory is allocated in the variable partition
multiprogramming. (Marks 6)
(Ii) Explain memory management in Linux. (Marks 10)
Or
(B) (i) Discuss in detail Segmentation. Compare it with paging. (Marks 8)
(Ii) Explain FIFO, LRU and Second-chance page replacement
Algorithms with an example reference string. (Marks 8)

14th (A) (i) Explain linked file allocation method. (Marks 6)
(Ii) Describe the Windows XP file system in detail. (Marks 10)
Or
(B) (i) What is the Role of Access matrix for protection? Explain. (Mark 5)
(Ii) What is meant by free space management? Explain. (Mark 5)
(Iii) Explain the directory structure of the Linux operating system. (Marks 6)

15th (A) (i) Explain the Services Provided by a kernel I / O Subsystem. (Marks 8)
(Ii) Explain and compare the C-LOOK and C-SCAN disk scheduling
Algorithms. (Marks 8)
Or
(B) (i) Write an elaborate note on the raid. (Marks 6)
(Ii) Explain in detail the Salient features of Linux I / O. (10)

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