III B.Tech II Semester Examinations,December 2010 OPERATING SYSTEMS Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Describe the attributes of the process. Describe the typical elements of the process control block. [16] 2. What is stable storage? Explain how to implement a stable storage along with various operation that can be performed on it. [2+14] 3. Write about: (a) Free space management (b) Reliability of a file allocation.
[8+8]
4. (a) What are the various methods for protection and access control. (b) Explain how worms and viruses can affect the operation of the computer.[8+8] 5. (a) Explain how protection is different from security.? (b) Discuss briefly about distributed system.
[8+8]
6. Write a bounded-buffer monitor in which the buffer are embedded within the monitor itself. [16] 7. Discuss in detail about the virtual memory implementation in Linux. 8. Describe a system model for study of deadlock situation. ?????
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[16] [16]
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Code No: 07A60501
R07
Set No. 4
III B.Tech II Semester Examinations,December 2010 OPERATING SYSTEMS Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the demand paged memory management in detail with an example. (b) Describe about dynamic partitioning and fixed partitioning.
[8+8]
2. (a) Explain file system software architecture. (b) What are the important criteria in choosing a file organization? (c) Explain the file and sequential file organization. 3. contrast and compare Program initiated I/O and Interrupt initiated I/O.
[6+4+6] [16]
4. (a) Explain the various password selection strategies. (b) Discuss about UNIX password scheme.
[8+8]
5. (a) Describe FCFS scheduling algorithm with a suitable example (b) Explain about Priority scheduling algorithm with suitable example.
[8+8]
6. (a) Compare the throughput of SCAN and C-SCAN assuming a uniform distribution of requests. (b) What is RAID? Explain how RAID level 5 is implemented? 7. Discuss briefly synchronization provided in solaris.
[8+8] [16]
8. Explain why having multiple copies of a resource does not prevent deadlocks from happening. [16] ?????
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Code No: 07A60501
R07
Set No. 1
III B.Tech II Semester Examinations,December 2010 OPERATING SYSTEMS Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Discuss in detail about the following disk scheduling algorithms: (a) FCFS (b) SSTF (c) SCAN (d) LOOK.
[16]
2. (a) Explain busy waiting and blocking wait? (b) Is busy waiting always less efficient than a blocking wait? Explain.
[8+8]
3. (a) Explain different protection mechanisms in Operating systems. (b) Explain authentication problem with an example.
[8+8]
4. (a) What are the different block based file organization techniques? Explain briefly. (b) Compare and contrast chained allocation with indexed allocation technique of file allocation. [8+8] 5. Differentiate between the following: (a) Thread Vs process (b) Process switching Vs context switching.
[8+8]
6. Explain the deadlock detection methods for single instance of resource types with an example. [16] 7. List all the steps that are necessary in order to run a program on a completely dedicated machine. [16] 8. (a) What is the relationship between FIFO and clock page replacement algorithm? (b) What is the difference between resident set management and page replacement policy? [8+8] ?????
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Code No: 07A60501
R07
Set No. 3
III B.Tech II Semester Examinations,December 2010 OPERATING SYSTEMS Computer Science And Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Differentiate between the following: (a) Character-stream Vs Block Devices (b) Sharable Vs Dedicated Devices (c) Sequential Vs Random Devices (d) Synchronous Vs Asynchronous Devices.
[4+4+4+4]
2. Explain various steps involved in change of a process state.
[16]
3. Write short notes on: (a) deadlock (b) starvation.
[8+8]
4. (a) Distinguish between protection and security of a computer system. (b) What is language-based protection? Explain
[8+8]
5. What are the main difficulties in writing an OS for a real time environment. [16] 6. (a) How page faults are handled in demand paging? (b) Explain briefly about the hardware requirements for demand paging. (c) If the average page fault service time of 25ms and a memory access time in 100ns. Calculate the effective access time. [5+5+6] 7. Explain file sharing and discuss about the access right and management of simultaneous access. [16] 8. Discuss the reasons why operating system might require accurate information on how blocks are stored on a disk. How can the OS improve the performance of the file system with this knowledge? [16] ?????
(a) What are the different block based file organization techniques? Explain. briefly. (b) Compare and contrast chained allocation with indexed allocation ...
Show that R is an equivalence relation. (b) Let A = {1, 2, 3, 4} and P = {{1, 2,3}, {4}} be a partition of A. Find the. equivalence relation determined by P. [10+6]. 3.
(a) Give a detailed comparison between combinational logic circuits and sequential. logic circuits. (b) Design a basic flip flop and explain its operation. [8+8] ?
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What will be the discharge when a cast iron. pipe of roughness k = 0.3 mm is used ? what will be the percentage increase in. the discharge if the cast iron pipe is ...
(c) Give the truth table for the Boolean expression (X0+Y)0. [4+8+4]. 6. Using Q-M method to determine the prime implicants and obtain the possible. minimal ...
(b) What are the advantages and disadvantages of Ellingham diagrams? [8+8]. 6. (a) Explain what do you mean by thermodynamic equillibrium. (b) Discuss the ...
