| CS-202 Operating Syseems (B.Tech 4rd Semester, 2122) Time : 3 Hours Maximum Marks : 60 NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from Section B and any two questions from Section C Section-A Marks : 2 Each 1 (a) What is real time O.S. ? Give a real life example. (b) What is meant by System Calls ? (c) what is the purpose of the command intepreter ? Why is it totally separated from kernel ? (d) What is pre-emptive Scheduling ? (e) What is meant by safe and unsafe state ? (f) Consider a logical address space of eight pages of 1024 words each, mapped onto a physical memory of 32 frames. (i) How many bits are there in the logical address ? (ii) How amny bits are there in ther physical address ? (g )What is dynamic Relocation ? (h) What is capabilkity list ? (i) What is meant by Atomicity of Transaction ? (j) Explain the term Trojan horse. Section-B Marks:5 Each 2. What ar the five major activities of an operating system in regard to process management ? 3. What resourses are used when a thread is created ? How do they differ from those used when a process is created ? 4. Consider the following set of processes with the length of CPU brust time in milliseconds : Process Brust Time Priority P1 10 3 P2 1 1 P3 2 3 P4 1 4 P5 5 2 The processes are assumed to have arrived in the order P1, P2, P3, P4 and P5 all at time 0. (a) Draw four Gantt charts illustrating the execution of these processes using FCFS, SJF, a nonpreemptive priority ( a smaller priority number implies a higher priority ) and RR (quantum = 1 ) scheduling. (b) What is the turn-around time of each process for each od the scheduling algrothims in part (a) ? (c) What is the waiting time of each process for each of the scheduling algrothims in part (a) ? (d) Whaich of the schedules of part (a) results in minimal average waiting time (over all processes ) ? 5. State Bankers Algrothim and brieflt explain its use. 6. When do page fault accurs ? Describe the actions taken by the operating system when a page fault occurs. Section-C Marks : 10 Each 7. Explain paging in detail. Why is page size always a power of 2 ? 8. (a) Discuss various disk scheduling algrothims with relative merits. (b) Is there any way to implement truly stable storage ? Explain your answer. 9. (a) Explain the file system in UNIX. (b) Write a note on Distributed Operating Systems. |
| OPERATING SYSTEMS |
| PAPER NO.2 |
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| PUT ON JUNE., 2K2 |