GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-IV (NEW) EXAMINATION — WINTER 2020
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Subject Code:3140702 Date:09/02/2021
Subject Name:Operating System
Time:02:30 PM TO 04:30 PM Total Marks:56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
|---|---|
| Q.1 (a) Explain structure of Operating System. | 03 |
| (b) Draw and explain five state Process State Transition Diagram. | 04 |
| (c) Solve following example by FCFS and SJF CPU scheduling algorithm. Draw Gantt Chart and calculate Average Waiting Time and Average Turnaround time. | 07 |
Process Arrival Time | Burst Time
PO 0 10
Pl 1 6
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P2 3 2
P3 5 4
| Q.2 (a) State features of distributed operating system. | 03 |
| (b) Explain principle of concurrency in brief. | 04 |
| (c) Explain Dining philosopher problem and its solution using semaphore. | 07 |
| Q.3 (a) Explain pure virtualization in brief. | 03 |
| (b) What is deadlock? List the conditions that lead to deadlock. | 04 |
| (c) State the need of demand paging. Explain the steps to handle a page fault using demand paging. | 07 |
| Q.4 (a) Explain Access Control List in brief. | 03 |
| (b) Write a Shell script to find Factorial of a given number. | 04 |
| (c) Disk requests come in to the disk driver for cylinders 10, 22, 20, 2, 40, 6, and 38, in that order. A seek takes 6 msec per cylinder moved. How much seek time is needed for (a) First-come, first served. (b) Closest cylinder next. In all cases, the arm is initially at cylinder 20. | 07 |
| Q.5 (a) Explain different services provided by operating system. | 03 |
| (b) Explain process control block with diagram. | 04 |
| (c) Explain Thread Scheduling with suitable example. | 07 |
| Q.6 (a) Give the difference between multitasking OS and multiprogramming OS. | 03 |
| (b) Explain Mutual Exclusion in brief. | 04 |
| (c) Explain producer consumer problem. Write pseudo code for the same. | 07 |
| Q.7 (a) Explain need of Virtual Machines. | 03 |
| (b) How Resource Trajectories can be helpful in avoiding the deadlock? | 04 |
| (c) Given memory partitions of 100 KB, 500 KB, 200 KB, 300 KB and 600 KB (in order), how would each of the first-fit, best-fit and worst-fit algorithms place processes of 212 KB, 417 KB, 112 KB and 426 KB (in that order) ? Which algorithm makes the most efficient use of memory? | 07 |
| Q.8 (a) Write a note on Generic Security Attacks. | 03 |
| (b) Explain Unix Commands — grep, sort, cat, chmod. | 04 |
| (c) Explain RAID level system in detail. | 07 |
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