| 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 the purpose of system calls ? (b) Define process. (c) What is non-preemptive scheduling ? (d) What information is contained in PCB ? (e) Is it possible to have a deadlock involving only one single process ? Explain your answer. (f) Consider a logical address spalce 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 are bits are there in the physical address ? (g) What is dynamic relocation ? (h) What is thrashing ? (i) Explain the concept of stable storage. (j) Explain the worm as concern system threats. Section-B Marks:5 Each 2. Describe the action taken by a kernal to context switch : (a) Among threads. (b) Among Processes. 3. What advantage is there in having different time-quantum sizes on different levels of a multilevel queuing system ? 4. What is the meaning of the term busy waiting ? What other kinds of waiting is there ? Can busy waiting be avoided altogether? Explain your answer. 5. Explain the use of semaphores for process synization. 6. Why and how are segmentation and paging sometimes combined into one scheme ? Section-C Marks : 10 Each 7. List five serveces provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs toprovide these services. 8. (a) Discuss various page replacement algrothims. What is Balady's anomaly ? (b) Explain the concept of virtual memory with its advantages. 9. Explain the security features of Windows NT O.S. |
| OPERATING SYSTEMS |
| PAPER NO.1 |
| Similar papers: Operating system (CS-262) OF ELECTRONICS AND COMMUNICATION ENGINEERING |
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| PUT ON DEC., 2K2 |