Question Paper: Operating Systems : Question Paper Jun 2014 - Electronics & Communication (Semester 6) | Visveswaraya Technological University (VTU)
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Operating Systems - Jun 2014

Electronics & Communication (Semester 6)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) Explain the goal of an operating system.(6 marks) 1 (b) Explain the designer's view of operating system.(4 marks) 1 (c) Explain modes of performing I/O operations.(5 marks) 1 (d) Explain the benefits / features of distributed operating system.(5 marks) 2 (a) Explain the functions of an operating system.(5 marks) 2 (b) Explain the layered design of operating system.(8 marks) 2 (c) Explain the concept of VMOS with example.(7 marks) 3 (a) Explain the contents of process control block.(6 marks) 3 (b) List the different types of process interaction and explain them in brief.(6 marks) 3 (c) Explain with a neat diagram, the different states of process in UNIX operating system.(8 marks) 4 (a) Describe static and dynamic memory allocation.(4 marks) 4 (b) Compare the contiguous and non-contiguous memory allocation.(4 marks) 4 (c) What is boundary tag? Explain merging of free areas using boundary tags?(8 marks) 4 (d) Explain the lazy buddy allocator.(4 marks) 5 (a) Explain the important concepts in the operation of demand paging.(12 marks) 5 (b) Find the number of page faults for following page reference string, using the FIFO and LRU page replacement policies.
Reference string: 5,4,3,2,1,4,3,5,4,3,2,1,5. (Assume page frames=3).
(8 marks)
6 (a) Describe the different operations performed of files.(8 marks) 6 (b) Explain the organization of sequential access and direct access files.(8 marks) 6 (c) Describe file system actions during a file operation.(4 marks) 7 (a) Compute mean turn around time and mean weighted turn around time for following set of process, using FCFS and SRN scheduling.

Processes P1 P2 P3 P4 P5
Arrival time 0 2 3 5 8
Service time 3 3 2 5 3
(10 marks) 7 (b) Explain the process schedule with a neat schematic diagram.(5 marks) 7 (c) Summarize the approaches to real time scheduling.(5 marks) 8 (a) Explain Buffering of interprocess message.(6 marks) 8 (b) Describe the delivery of interprocess messages.(6 marks) 8 (c) Write a short note on mailbox.(8 marks)

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