Kerala University 2007 M.C.A FOURTH SEMESTER , E/Y 2002 not - Question Paper

OPERATING SYSTEMS
Time: 3 Hours Maximum: 75 Marks
ans any 2 ques. from every module.
Module I
1.
a) With the help of state transition diagram, discuss the functions of operating system.
(7½ marks)
b) Why is distributed operating system desirable? discuss. (5 marks)
2.
a) Which are the various kinds of schedulers? discuss them highlighting why they are needed. (7½ marks)
b) define the action taken by the Kernel to switch ranging from (i) threads; and (ii) processes. (5 marks)
3.
a) elaborate system caIls? provide examples of system calls in any typical operating system. (7½ marks)
b) define the layered approach to O.S. design. discuss its advantages. (5 marks)
Module II
4.
a) discuss the criteria used for scheduling.
b) Write a detailed note on multiple processor scheduling
5.
a) discuss learners and authors issue. In what way this issue is various from the producer-consumer problem? (7½ marks)
b) What is meant by critical region? discuss. (5 marks)
6.
a) discuss the operation of a paging system using inverted TLB. (7½ marks)
b) What is meant by deadlock condition? elaborate its characteristics? (5 marks)

Module III
7.
a) Specify the structure of the page map table, and bring out its use in memory management. (7½ marks)
b) Differentiate ranging from internal and external fragmentation. (5 marks)
8.
a) What is Thrashing? Why does it occur? Once it occurs, what can the operating system do to eliminate it? (7½ marks)
b) What is the need for using associative memory to store at lowest a part of the Page Map table entries? (5 marks)
9. Write short notes on:
a) Demand paging.
b) Page replacement algorithms.
c) Unix operating system.
(3 x five = 15 marks)

Earning:   Approval pending.