Operating Systems : Question Paper Dec 2014 - Information Technology (Semester 5)

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Operating Systems - Dec 2014

Information Technology (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Answer any four:

1 (a) Differentiate: Monolithic kernel and Micro kernel.(5 marks) 1 (b) Discuss I/O buffering in detail.(5 marks) 1 (c) Explain Semaphore.(5 marks) 1 (d) Write short note on: producer-consumer problem.(5 marks) 1 (e) Compare and contrast: thread and process.(5 marks) 2 (a) What is Deadlock? State necessary conditions for deadlock. How to prevent deadlock?(10 marks) 2 (b) Draw process state transition and explain the following transitions:
i) Running to ready
ii) Waiting to ready
iii) Running to waiting
iv) Blocked to ready
v) Running to terminated(10 marks) 3 (a) Calculate Hit and Miss using LRU, Optimal, FIFO page replacement policies for the following sequence. Page frame size is 3.
0,4,3,2,1,4,6,3,0,8,9,3,8,5.(10 marks) 3 (b) Explain the allocation methods in details with proper diagram.(10 marks) 4 (a) Use following scheduling algorithms to calculate ATAT and AWT for the following processes.
i) FCFS
ii) Pre-emptive and non pre-emptive SIF
iii) Preemptive priority.

Process	Arrival Time	Brust Time	Priority
P1	0	8	3
P2	1	1	1
P3	2	3	2
P4	3	2	3
P5	4	6	4

(10 marks) 4 (b) What is meant by inter-process communication?(10 marks) 5 (a) Explain paging in detail. Describe how logical address is converted into physical address?(10 marks) 5 (b) Using Banker's algorithm answer the following questions :-
(i) How many resources to type A,B,C and D are there?
(ii) What are the contents of Need Matrix?
(iii) Is the system is in safe state? find the state sequence if it is.

Process	Max A B C D	Allocation A B C D	Available A B C D
P0	6 0 1 2	4 0 0 1	3 2 1 1
P1	1 7 5 0	1 1 0 0
P2	2 3 5 6	1 2 5 4
P3	1 6 5 3	0 6 3 3
P4	1 6 5 6	0 2 1 2

(10 marks)

Write short notes on: (any four)

6 (a) Characteristics of Modern operating system(5 marks) 6 (b) RAID(5 marks) 6 (c) Android OS(5 marks) 6 (d) Distributed operating system(5 marks) 6 (e) I-node(5 marks)

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