Download VTU BE 2020 Jan ECE Question Paper 17 Scheme 5th Sem 17EC553 Operating System

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Note: Answer any FIVE full questions. choosing ONE full question from each module.
I a.
b.
c.
od ole-1

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Define operating system. Explain the key concern and of an operating system.
Explain the various resource allocation and resource sharing strategies.
What are the common tasks performed by an operating system?
(07 Marks)
(08 Marks)

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(05 Marks)
OR
2 a. Explain briefly, the different classes of operating system with primary concern and key
concepts. (10 Marks)
b. With a neat diagram explain the turnaround time in batch processing system. (06 Marks)

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c. Discuss various computations in an operating system. (04 Marks)
Module-2
3 a. Define process, process states and with a state transition diagram explain the
for a process.
b. Discuss the different fields of the process control block (PCB).

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c. What are the differences between threads and processes?
OR
4 a. For a given set of processes perform FCFS and SRN scheduling and
performance interms of mean turnaround time and weighted turn around.
Process P

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I P2 P3 P4 P5
Arrival time 0 2 3 5 9
Service time 3 3 2 5 3
state transition
(10 Marks)

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(06 Marks)
(04 Marks)
compare their
(10 Marks)
b. With a neat sketch, explain long, medium and short term schedulers.

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c. Compare non-preemptive and preemptive scheduling concepts.
(06 Marks)
(04 Marks)
Module-3
5 a. Define the following terms with necessary sketches :

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i) Internal and external fragmentation
ii) Paging and segmentation
iii) Logical address and physical address.
iv) Page and page frame. (12 Marks)
b. With a neat diagram explain the working of address translation in non-contiguous memory

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allocation. (08 Marks)
OR
6 a. With a neat sketch, explain demand paging preliminaries. (12 Marks)
b. Consider the page reference string 0, 1, 2, 1, 3, 0, 4, 1, 2, 1, 3, 7, 4, 5, 7. Calculate the page
faults. Using FIFO and LRU page replacement policies with a frame size 3. (08 Marks)

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17EC553
USN
Fifth Semester B.E. Degree Examination, Dec.2019/Jan.2020

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Operating System
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions. choosing ONE full question from each module.
I a.
b.

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c.
od ole-1
Define operating system. Explain the key concern and of an operating system.
Explain the various resource allocation and resource sharing strategies.
What are the common tasks performed by an operating system?

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(07 Marks)
(08 Marks)
(05 Marks)
OR
2 a. Explain briefly, the different classes of operating system with primary concern and key

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concepts. (10 Marks)
b. With a neat diagram explain the turnaround time in batch processing system. (06 Marks)
c. Discuss various computations in an operating system. (04 Marks)
Module-2
3 a. Define process, process states and with a state transition diagram explain the

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for a process.
b. Discuss the different fields of the process control block (PCB).
c. What are the differences between threads and processes?
OR
4 a. For a given set of processes perform FCFS and SRN scheduling and

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performance interms of mean turnaround time and weighted turn around.
Process P
I P2 P3 P4 P5
Arrival time 0 2 3 5 9
Service time 3 3 2 5 3

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state transition
(10 Marks)
(06 Marks)
(04 Marks)
compare their

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(10 Marks)
b. With a neat sketch, explain long, medium and short term schedulers.
c. Compare non-preemptive and preemptive scheduling concepts.
(06 Marks)
(04 Marks)

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Module-3
5 a. Define the following terms with necessary sketches :
i) Internal and external fragmentation
ii) Paging and segmentation
iii) Logical address and physical address.

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iv) Page and page frame. (12 Marks)
b. With a neat diagram explain the working of address translation in non-contiguous memory
allocation. (08 Marks)
OR
6 a. With a neat sketch, explain demand paging preliminaries. (12 Marks)

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b. Consider the page reference string 0, 1, 2, 1, 3, 0, 4, 1, 2, 1, 3, 7, 4, 5, 7. Calculate the page
faults. Using FIFO and LRU page replacement policies with a frame size 3. (08 Marks)
1 of 2
R1 R2 R3
5 7 5

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Total resources
17EC55,
Module-4
7 a. Explain file system and IOCS with necessary sketches. (08 Marks)
b. Explain any three allocation methods of disk space for files and mention advantages and

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disadvantages of each. (12 Marks)
OR
8 a. What is a directory? Discuss typical directory entry fields and explain different directory
structures. (12 Marks)
b. Discuss the working of file system action at file close. (08 Marks)

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Module-5
9 a. Write a note on :
i) Issues in message passing
ii) Direct and indirect naming in message passing
iii) Blocking and non-blocking sends in message passing.

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b. Explain mailboxes, give the advantages of mail boxes.
(12 Marks)
(08 Marla
OR
10 a. With necessary sketches, explain the different deadlock prevention approaches. (10 Marks)

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b. Using deadlock detection algorithm for the following example of system check, whether the
deadlock exist in the system or not.
(10 Marks)
R1 R2 R3
P

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1
2 I 0
P2 1 3 1
P3 1 1 1
P4 1 2 2

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R
I
R2 R3
P
1

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2 1 3
P2 1 4 0
P3 0 0 0
P4 1 0 2
R

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1
R2 R3
0 0 1
Free Resources
Allocated Resources Requested Resources

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