FACULTY OF ENGINEERING B.E. 3/4 (CSE) I – Semester (New) (Suppl) Examination, May 2013 Subject : Operating Systems Time : 3 hours
Max. Marks : 75
Note: Answer all questions from Part-A and answer any FIVE questions from Part-B. PART – A (25 Marks) 1. Define the following terms : a) Multiprogramming
b) Multi tasking
c) time sharing
3
2. Give formula(e) to calculate the following : a) turn around time b) waiting time
3
3. What is thrashing? How do you overcome such situation?
3
4. What is a resource allocation graph? What is its use? Give an example.
2
5. What is access matrix? Give an example.
2
6. What is RAID? Give its structure.
3
7. What is symmetric multiple casing?
2
8. What is a page fault? What does the OS do in case of page fault?
3
9. What are the three components to the module support under Linux?
2
10. Give the structure of a typical file control block (FCB).
2
PART – B (50 Marks) 11. Calculate the average waiting time and overage turn around time for the following data using 10 a) FCFS algorithm c) Round cabin algorithm
b) Preemptive JF algorithm
Assume that the time quantum is 5 time units. Process P1 P2 P3 P4
Burst time 15 10 25 5
Arrival time 0 1 2 3
12.a) List and explain the four necessary conditions for a deadlock to occur.
6
b) What is Belady's anomaly? Why does it occur only in FCFS policy?
4
13. Calculate the number of page faults for the following reference string using a) Optional page replacement algorithm b) LRU page replacement c) FIFO page replacement algorithm. Assume that the number of page frames are 4. 10 Reference string : 1, 5, 1, 2, 5, 3, 2, 4, 8, 7, 3, 4, 2, 10, 3 ..2
Code No. 2111 / N -214.a) Discuss the concept, usage and application of TSL instruction. b) Discuss the concept of producer-consumer problem. 15.a) Discuss the concept of the following disk scheduling algorithms. b) Discuss the concept of i-node in Unix. Give its structure. 16. Discuss the following design goals of Windows XP : a) Reliability c) Extensibility
5 5 6 4 10
b) High performance d) Portability
17.a) Discuss the following concepts related to resource preemption : i) Roll back ii) Starvation b) Discuss the following related to Banker's algorithm. i) Concept ii) Data structures needed ******
Vasavai CE BE CSE 3rd Year May 2013 Operating Systems(New).pdf
What is a resource allocation graph? What is its use? Give an example. 2. 5. What is access matrix? Give an example. 2. 6. What is RAID? Give its structure. 3. 7.
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