Download JNTUH MCA 3rd Sem R17 2020 November 843AC Operating Systems Question Paper

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Code No: 843AC

R17

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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA I Semester Examinations, October/ November - 2020

OPERATING SYSTEMS

Time: 2 Hours Max.Marks:75

Answer any five questions

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All questions carry equal marks

1. a) What is an operating system? Explain the objectives and functions of an operating system. [7+8]
2. b) Differentiate between parallel system and distributed system. [15]
3. List and explain various disk utilities, process utilities and filters in Linux with clear syntax, options and example. [15]
4. a) Following is the snapshot of a CPU
   

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   Process CPU Burst Arrival Time Priority
   P1 12 0 1
   P2 09 1 3
   P3 18 2 5
   P4 05 3 2
   

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   P5 20 4 4
   Draw the Gantt chart and calculate the turnaround time and waiting time of the jobs for FCFS (First Come First Served), SJF (Shortest Job First), SRTF (Shortest Remaining Time First) and RR (Round Robin with time quantum 5) and priority scheduling algorithms. [15]
5. Discuss briefly about Resource-allocation graph.
6. Consider the following snapshot of a system:
   Processes Allocation Max Available
   

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   ABCD ABCD ABCD
   P0 0012 0012 1520
   P1 1000 1750
   P2 1354 2356
   P3 0632 0652
   

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   P4 0014 0656
   Answer the following questions using the banker’s algorithm:
   1) What is the content of the matrix Need?
   i1) Is the system in a safe state?
   ii1) If a request from process P1 arrives for (0, 4, 2, 0), can the request be granted immediately? [7+8]

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7. a) What is producer-consumer problem? Explain how semaphores are to implement producer-consumer problem and address the issues raise due to lack of synchronization. [15]
8. b) List and explain various APIs available to implement inter process communication using message queues. [15]
9. How many page faults occur for the following reference string with three and four page frames using FIFO, LRU and OPTIMAL page replacements algorithms? Assume that initially frames are empty. 3,2,4,3,4,2,2,3.4,5,6,7,7,6,5,4,5,6,7,2,1 [15]
10. a) Explain briefly about directory management and directory implementation.
11. b) Explain about lseek, create and write. [7+8]

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