DISTANCE EDUCATION
P.G.D.C.A. EXAMINATION, MAY 2017.
First Semester
Computer Applications
OPERATING SYSTEMS
(2011 Calendar Year onwards)
Time Three hours Maximum 100 marks
SECTION A — 8 40 marks)
Answer any FIVE questions.
1. What are the services provided by an Operating System?
Explain.
2. Describe the structure of operating system.
3. Explain briefly about the inter process communication.
4. What is binary and counting semaphore? Explain.
5. What are the four necessary conditions of deadlock
prevention? Explain.
6. Discuss the concept of segmentation? What is the main
problem with segmentation?
7. What is a file? What are the operations of file?
8. What are the four levels of security measures? Explain.
Sub. Code
14
DE-032
2
Ws9
SECTION B — 15 60 marks)
Answer any FOUR questions.
9. What is a system call? Describe the types of system calls.
10. Explain about the Round robin and shortest job first
process scheduling.
11. What is mutual exclusion? Explain with example.
12. What is Deadlock? Explain the two approaches to
deadlock avoidance.
13. Explain the goals and functions of I/O software and
Device drivers.
14. What are the page replacement strategies? Explain any
four of them.
15. Write a short note on
File system performance
Directory structure.