Download JNTUH MCA 3rd Sem R15 2018 June-July 823AA Operating Systems Question Paper

Download JNTUH (Jawaharlal nehru technological university) MCA (Master of Computer Applications) 3rd Sem (Third Semester) Regulation-R15 2018 June-July 823AA Operating Systems Previous Question Paper

Code No: 823AA















R15

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA III Semester Examinations, June/July - 2018

OPERATING SYSTEMS

Time: 3hrs













Max.Marks:75


Note: This question paper contains two parts A and B.

Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B
consists of 5 Units. Answer any one full question from each unit. Each question carries
10 marks and may have a, b, c as sub questions.



PART - A



















5 ? 5 Marks = 25

1.a) Mention any two operating system calls.











[5]

b) Differentiate preemptive scheduling with non-preemptive scheduling.



[5]

c) Differentiate virtual memory with physical memory.







[5]

d) Mention file access methods.













[5]

e) Discuss goals of protection.













[5]

PART - B

















5 ? 10 Marks = 50

2.a)

Define an operating system. What is its purpose?

b)

Explain the various functions of an operating system.







[5+5]

OR

3.a)

Explain the basic features of Real time operating systems.

b)

Write the differences between the traps and interrupts.







[5+5]


4.

Explain process states with a neat diagram.









[10]

OR

5.a)

What is meant by critical section problem? Mention conditions for critical section.

b)

Compare semaphores and monitors.











[5+5]


6.a)

Explain Paging with Segmentation?

b)

What is page fault? Explain page fault service routine with a neat diagram.

[5+5]

OR

7.

Explain Page Replacement Algorithms with examples.







[10]


8.

Consider, an ordered disk queue with requests involving in tracks listed in the following
order 98, 183, 37, 122, 14, 124, 65 and 67. Read -Write head is initially at track 53 and
moving towards track 0. Find the total head movement for the following disk scheduling
policies
a) FCFS

b) SSTF

c) SCAN

d) C-SCAN





[10]

OR

9.

Explain various file access methods and directory structures.





[10]



10.a) Enumerate the conditions that characterize a dead-lock?
b) Explain resource allocation (graph) algorithm for dead lock detection with relevant

diagrams.



















[5+5]

OR

11.

Explain Access control matrix in detail.











[10]



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