LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc., DEGREE EXAMINATION – COMPUTER SCIENCE

FIFTH SEMESTER – NOVEMBER 2012

CS 5504 – OPERATING SYSTEMS

 

 

 

Date : 01-11-2012              Dept. No.                                        Max. : 100 Marks

Time : 9.00 – 12.00

 

PART –A

 

ANSWER ALL THE QUESTIONS:                                                                                  (10 X 2 = 20)

 

1. Name the two modes in which the operating system functions.
2. What is a system call?
3. What is process table?
4. What are the four conditions for deadlock occurrence?
5. Define swapping
6. What is the key idea behind segmentation?
7. What is spooling?
8. Define interrupt.
9. What is a directory?
10. List any four user interface utility program in unix.

PART – B

 

ANSWER ALL THE QUESTIONS:                                                                                  (5 X 8 = 40)

 

11. a) What is an operating system? Explain.

(OR)

1. b) Compare and contrast virtual machine and client server model.

 

12. a) What is critical section? How semaphore helps in the execution of critical section?

(OR)

1. b) Explain about the deadlock prevention techniques.

 

13. a) How do operating system manage memory using linked list and bit vector? Explain.

(OR)

1. b) Discuss in detail about LRU page replacement algorithms.

 

14. a) Discuss about Direct memory access.

(OR)

1. b) Explain about terminals.

 

15. a)Explain in detail unix file system.

(OR)

b)Discuss about the various file allocation techniques.

PART – C

 

Answer any TWO Questions:                                                                                         (2 X 20 = 40)

 

16. a) Discuss in detail about any two process scheduling algorithms.       (10 marks)
17. b) Write note on deadlock recovery.                                                                   (10 marks)
18. a) Discuss in detail about the Banker’s algorithm for deadlock avoidance. (10 marks)
19. b) What is paging? Discuss about the hardware techniques used to implement

page tables.                                                                                                       (10 marks)

18. a) Discuss in detail about principles of I/O software. (10 marks)
19. b) Discuss in detail about Directories and its implementation in various operating

systems.                                                                                                                           (10 marks)

 

 

 

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