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Posted By: Sriram Member Level: Diamond Posted Date: 13 Jun 2008
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2006 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech OPERATING SYSTEMS Set No. 3 Question paper
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Code No: RR410401 Set No. 3
IV B.Tech I Semester Regular Examinations, November 2006
OPERATING SYSTEMS
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. What is OS? Describe the different types of Operating systems with the examples.
[16]
2. (a) Explain the reasons for process terminations.
(b) Describe the single blocked queue and multiple blocked queues with an exam-
ple. [4+12]
3. Explain the state of the process Queue for the Readers / Writers problem and get
the solution to the same by using message -passing [8+8]
4. What is deadlock avoidance? Explain process initiation denial and resource allo-
cation denial in detail with example. [4+4+4+4]
5. Consider a memory management system with demand paging. There are there
processes P1, P2, P3 which have one page of private memory each. Moreover P1
and P2 are sharing an array A which fits entirely into one memory page. Similarly,
P2 and P3 are sharing an array B, which fits into a memory page.
(a) Let all the data for the processes be located into physical memory. Draw a pos-
sible memory allocation diagram, give the page tables for the three processes.
(b) Assume that process P1 gets swapped out of memory entirely. How are the
page tables changing.
(c) Assume that process P1 gets swapped back into memory. Give the page tables
in this situation. [5+5+6]
6. (a) What are preemptive and non-preemptive scheduling policies?
(b) Describe non-preemptive scheduling policies [8+8]
7. (a) What do you understand by a file directory?
(b) Explain briefly the information elements of a file directory
(c) Explain what is tree-structured directory? [5+5+6]
8. What do you understand by Trusted systems? Draw a figure of reference monitor
concept and explain. [5+5+6]
? ? ? ? ?
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