Mumbai university question papers Computer science 4th Sem Operating System

Mumbai university question papers Computer science

4th Sem Operating System 

Question No.1 is compulsory.
Attempt any four questions out of remaining six questions.
AN-3445
[Total Marks: 100

1. a) What is an operating system? Explain in brief the different services which It
provides.
b) bExplain differentsystemcalls of O.S. .
. ihDifferentiatemonolithic.andlayeredstmcture ofO.S.
2 a) Consider the following set of processes with the length of cpu burst given in .
Ms.”
Process       Burst time           Priority
P1                   10                               3 ”
P2                     1                                1
P3                      2                             4
P4                      1                             2
P5                     5                               2
The processes are assumed to have arrived in the order pI, p2, p3, p4, p5 at time O.
i”) Draw the Gantt chart for FCFS, SJF, Priority and Round Robin (Quantu,-n=l).
ii) Which algorithm results in the maximum average waiting time? “10
b) Explain multilevel queue scheduling. Jo
3. a) What is deadlock? Explain various deadlock prevention techniques.
b) Explain critical section problem and its different solutions.

4. a) Explain paging in detail. Describe how logical address converted to physical
address. 10
b) Calculate Hit and Faults using various page replacement 1.’t)
policies.(FIFO,LRU,OPT). for the following page sequence:
” (The page frame size is 3). ” .

S. a) Explain different techniques of disk scheduling.
b) Explain process concurrency/synchronization pfwindows O.S.
6. a) Explain file allocation in detail. ”
b) Explain how memory management takes place in Linux.

7. Write short notes on ~-
i) Semaphore –
ii) Unix File System
iii) Segmentation
iv) Distributed O.S.

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