Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) What is disk scheduling? Explain various disk scheduling algorithms.
10 M
1(b) Explain various system calls with appropriate syntaxes.
10 M

2(a) Explain necessary and sufficient conditions for deadlock, also explain how a resource allocation graph determines a deadlock.
10 M
2(b) What is Kernel? Describe briefly the approaches of designing Kernel
10 M

3(a) Draw and explain architecture of RTOs.
10 M
3(b) Explain programmed I/O and DMA
10 M

4(a) What is semaphore? Explain different types of semaphores.
10 M
4(b) Write a short note on File Access Methods.
10 M

5(b) What are the characteristics of real time system?
10 M
5(a) What is mutual exclusion? Explain Petersons algorithm for mutual exclusion.
10 M

6(a) What are pre - emptive and non - pre - emptive algorithms? Explain any two with the help of example.
10 M
6(b) Write a short note on buffering techniques.
10 M

Write short notes on the following :-
7(a) User threads and Kernel threads.
5 M
7(b) Race conditions.
5 M
7(c) Demand paging.
5 M
7(d) Monitor
5 M



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