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Posted By: kishore       Member Level: Gold       Posted Date: 24 May 2008

2007 Jawaharlal Nehru Technological University M.C.A Computer Aplications OPERATING SYSTEMS Question paper Course: M.C.A Computer Aplications   University: Jawaharlal Nehru Technological University 1.a) What are the main purposes of an operating system? b) Define the essential differences between the following types of operating systems: i) Batch ii) Interactive iii) Time sharing iv) Real time c) What is the purpose of the command interpreter? Why is it usually separate from the kernel? 2.a) Define the difference between preemptive and non preemptive scheduling. State why strict non preemptive scheduling is unlikely to be used in a computer center. b) Five batch jobs A through E, arrive at a computer center at almost the same time. They have estimated running times of 10, 6, 2, 4 and 8 minutes. Their (externally determined) priorities are 3, 5, 2, 1 and 4, respectively, with 5 being the highest priority. For each of the following scheduling algorithms, determine the mean process turn arount time. Ignore process switching overhead. i) Round Robin ii) Priority scheduling iii) First come, first served (run in order 10, 6, 2, 4, 8). iv) Shortest job first. For i) assume that the system is multi programmed and that each job gets its fair share of the CPU. For ii) through iv) assume that only one job at a time runs, until it finishes. All jobs are completely CPU bound. 3.a) Define the critical section problem. b) Write an algorithm for solving the critical-section problem for n processes. 4.a) State and explain the necessary conditions for a deadlock to occur. b) Explain in detail how we can prevent the occurrence of a deadlock. Contd….2 NR Code No: NR-21/MCA -2- 5.a) Explain the difference between logical and physical addresses. b) Why are segmentation and paging combined into one scheme? c) Explain briefly the use of inverted page table. 6.a) When do page faults occur? Describe the actions taken by the operating system when a page fault occurs. b) Consider the following page reference string: 1,2,3,4,2,1,5,6,2,1,2,3,7,6,3,2,1,2,3,6 How many page faults would occur for the following replacement algorithms, assuming three frames? Remember that all frames are initially empty, so your first unique pages will all cost one fault each. (i) LRU replacement (ii) optimal replacement 7.a) Distinguish between the following directory structures: i) Acyclic – Graph Directories ii) Tree structured directory structure. b) Explain the different approaches used in implementing free-space list. 8. Write notes on the following: a) Capability based protection systems b) Computer – security classifications. Return to question paper search

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