DISTANCE EDUCATION
B.C.A. DEGREE EXAMINATION, MAY 2017
PRINCIPLES OF OPERATING SYSTEM
(2003 Onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
All questions carry equal marks.
20
1. Enumerate the different services provided by
Operating System and explain them.
Explain the History of Operating System in detail.

2. Define a process. Explain the different Race
conditions in process management.
List out the different Process Scheduling
Algorithms and compare them.
3. Explain the concept of Mutual exclusion in detail.(10)
Discuss in detail message passing and multiple
queues.
4. Mention the goals of I/O Software.
Explain briefly on Interrupt handlers and Device
independent I/O Software.
Sub. Code
13
DE-173
2
WS 20
5. Define Deadlock. Explain the modeling of Deadlock
with neat sketch.
List out the ways to prevent and avoid deadlock
with an example.
6. Explain memory management without swapping or
paging in detail.
Discuss in detail multiprogramming with variable
partitions.
7. Enumerate the functions performed by memory
manager.
For the following page reference string, calculate
the number of page faults with FIFO and LRU page
replacement policies when
Number of page frames are three
Number of page frames are three
Page reference string 5432143543215
Reference Time string t1, t2, t3,....,t13.
8. Discuss in detail the concept of file system
reliability and its performance.
Illustrate in detail security and protection
mechanisms of files.