Download JNTUA MCA 2014 Feb 1st Sem 9F00204 Operating Systems Question Paper

Download JNTUA (JNTU Anantapur) MCA (Master of Computer Applications) 2014 Feb Regular-Supplementary 1st Sem 9F00204 Operating Systems Question Paper

Code: 9F00204

MCA II Semester Supplementary Examinations February 2014
OPERATING SYSTEMS
(For 2009, 2010, 2011 & 2012 admitted batches only)
Time: 3 hours Max. Marks: 60

Answer any FIVE questions
All questions carry equal marks
*****
1 (a) Give a brief note o the operating system structure.
(b) Discuss five major categories of system calls in detail.

2 Consider the following set of processes, with the length of the CPU burst given in milliseconds:
Process Burst Time Priority
P
1
10 3
P
2
1 1
P
3
2 3
P
4
1 4
P
5
5 2

The processes are assumed to have arrived in the order P
1
, P
2
, P
3
, P
4
and P
5
all at time 0.
(a) Draw four Gantt charts that illustrate the execution of these processes using the following
scheduling algorithms: FCFS, SJF, non preemptive priority (a smaller priority number implies a
high priority) and RR (quantum = 1).
(b) What are the turnaround and waiting processes for each process for each of the scheduling
algorithms in part a?

3 (a) Write the definition of swap ( ) instruction. Explain the implementation of mutual exclusion using
swap ( ).
(b) What is a semaphore? Give the solution to the dining-philosophers problem using semaphores
and explain.

4 (a) What are the benefits of executing a program that is partially in memory?
(b) List the typical elements found in a page table entry. Define each element.
(c) Explain the purpose of translation look aside buffer.

5 (a) Discuss various directory implementation techniques in detail.
(b) Write a short note on free space management.

6 (a) Give a detailed note on RAID levels.
(b) What is stable storage? Explain how it is implemented.

7 (a) ?A deadlocked state is an unsafe state. Not all unsafe states are deadlocks?. Illustrate this with
an example.
(b) Discuss resource allocation graph algorithm for deadlock avoidance.

8 (a) Make a comparison of various techniques for implementing an access matrix.
(b) What is the difference between a threat and an attack? Explain about the various security
attacks.
*****
FirstRanker.com - FirstRanker's Choice