Download JNTUH MCA 3rd Sem R15 2018 January 823AA Operating Systems Question Paper

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Code No: 823AA

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA III Semester Examinations, January — 2018

OPERATING SYSTEMS

Time: 3hrs Max.Marks:75

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.

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PART - A 5 x 5 Marks =25

1. a) What are the different types of System Calls. [5]
2. b) Discuss about the activities that happen during context switching? [5]
3. c) What is thrashing? [5]
4. d) Explain about swap space management. [5]

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5. e) Discuss about access control. [5]

PART -B 5 x 10 Marks =50

1. What is the need of operating system? Explain its functionalities. [10]
   OR
   Explain about operating system design and implementation. [10]

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2. What is Critical Section Problem? Discuss about Peterson’s solution. [10]
   OR
   What is Process? Explain about process control block. [10]
3. Explain first fit, worst fit and best fit allocation algorithms with examples. [10]
   OR
   

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   Explain about MFT and MVT. [10]
4. What is a Directory? Write short note on Directory implementation. [10]
   OR
   Suppose the head of a moving head disk with 200 tracks, numbered 0 to 199, is currently serving a request at track 123 and has just finished a request at track 125.If the queue of Requests is kept in FIFO order: 126, 17, 91, 107, 194, 150, 102, 105, 130, 12. What is the total head movement to satisfy these requests for the following disk scheduling algorithms? (a) FCFS b) SSTF c) SCAN [10]
5. Explain about capability based system. [10]

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6. Write and explain deadlock avoidance algorithm. [10]

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