Download JNTUH MCA 2nd Sem R19 2022 May 862AB Operating Systems Question Paper

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Code No: 862AB R19

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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MCA I Semester Examinations, May - 2022

OPERATING SYSTEMS

Time: 3 Hours Max.Marks:75

Answer any five questions

All questions carry equal marks

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1. 1. Examine the goals and functions of an operating system.
   2. Mention the advantages and disadvantages of time-shared operating systems. [8+7]
2. 1. Differentiate between Parallel systems and Distributed systems.
   2. What is meant by a system call? Discuss how an operating system makes use of system calls for implementing various services. [7+8]

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3. 1. What is the need of the process task control block in process management?
   2. How is fork() system call differs from an exec() system call? Explain with illustrative examples. [5+10]
4. 1. State the need for inter process communication.

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   2. Following is the snapshot of a CPU
      Process CPU Burst Arrival Time Priority
      P1 12 0 1
      P2 09 1 3
      P3 18 2 5
      

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      P4 05 3 2
      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), SJIF (Shortest Job First), SRTF (Shortest Remaining Time First) and RR (Round Robin with time quantum 5) and priority scheduling algorithms. [5+10]
5. 1. Give an example of classical problem of concurrent access to shared resources by multiple threads and show how it leads to deadlock?

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   2. Consider the following snapshot of a system: [6+9]
      Processes Allocation Max Available
      ABCD ABCD ABCD
      P0 0012 0012 2100
      P1 2000 2750
      

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      P2 0034 6656
      P3 2345 4356
      P4 0332 0652
      Answer the following questions using the banker’s algorithm:
      I) What is the content of the matrix Need?
      

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      II) Is the system in a safe state? Why?
      III) Is the system currently deadlocked? Why or why not?
6. What is a semaphore? Explain how semaphores are used to implement synchronization between processes with an illustrative example. [15]
7. What is paging and segmentation? Explain paging scheme with relevant diagrams in detail. [15]

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8. Explain different File Access Methods and different File Sharing Modes in file system. [15]