Download JNTUH MCA 3rd Sem R15 2017 August 823AA Operating Systems Question Paper

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Code No: 823AA R15

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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA III Semester Examinations, August - 2017

OPERATING SYSTEMS

Time: 3hrs Max.Marks:75

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Note: This question paper contains two parts A and B.

Part A is compulsory which carries 25 marks. Answer all questions in Part A.

Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.

PART - A 5 x 5 Marks =25

1. What are system programs? [5]

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2. Distinguish between a process and a thread. [5]
3. What are inverted page tables? [5]
4. Explain different file access methods. [5]
5. Explain how resource allocation graph is constructed. [5]

PART -B 5 x 10 Marks =50

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1. a) What are time shared and real time systems? Explain them in detail. [10]
   OR
   b) What are operating system objectives and functions?
2. a) What are virtual machines? What is their significance? [5+5]
   OR
   

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   b) What is critical section problem? Discuss the various hardware solutions to critical section problem. [10]
3. a) Explain real time scheduling using an example. [10]
   OR
   b) Explain various LRU-Approximation page replacement algorithms. [10]
4. a) What is thrashing? Why does it occur? What are different methods to handle thrashing. [10]
   

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   OR
   b) Define file. Discuss various file allocation strategies. Discuss the merits and demerits of various file allocation strategies. [10]
5. a) What are the merits and demerits of tree structured directories and acyclic graph directory structure? [10]
   OR
   b) Consider the following snapshot of a system:
   

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   Allocation max available
   ABCD ABCD ABCD
   P0 0012 0012 1520
   P1 1000 1750
   P2 1354 2356
   

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   P3 0632 0652
   P4 0014 0656
   Answer following questions using banker’s algorithm:
   i) What is the content of the matrix need?
   ii) Is the system in a safe state?
   

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   iii) If a request from a process p1 arrives for (0,4,2,0) can the request be granted immediately? [10]
6. What is a deadlock? Discuss various deadlock prevention strategies. [10]

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