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Operating Systems Exam Guide

The document contains 8 groups of tutorial questions on operating systems topics. Group 1 covers indexed file allocation and file system directory structures. Group 2 covers identity-dependent access control and process creation. Group 3 covers file access methods and indexed and linked allocation. Group 4 covers user file access control and process creation. Group 5 covers disk drive metrics and disk scheduling algorithms. Group 6 applies different disk scheduling algorithms to a sample disk request queue. Group 7 again covers identity-dependent access control, indexed allocation, disk formatting, and directory structures. Group 8 compares access methods, directory structures, and applies disk scheduling algorithms to a sample queue.

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51 views3 pages

Operating Systems Exam Guide

The document contains 8 groups of tutorial questions on operating systems topics. Group 1 covers indexed file allocation and file system directory structures. Group 2 covers identity-dependent access control and process creation. Group 3 covers file access methods and indexed and linked allocation. Group 4 covers user file access control and process creation. Group 5 covers disk drive metrics and disk scheduling algorithms. Group 6 applies different disk scheduling algorithms to a sample disk request queue. Group 7 again covers identity-dependent access control, indexed allocation, disk formatting, and directory structures. Group 8 compares access methods, directory structures, and applies disk scheduling algorithms to a sample queue.

Uploaded by

shemi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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TUTORIAL 5

Group 1:

1. Explain indexed allocation method with an example. (5 marks)


2. Explain the different directory structures used in file system.(10 marks)

Group 2:

1. Different users may need different types of access to a file or directory.


Explain
the most general scheme to implement identity dependent access. (4
marks)
2. How many child process will be created for the following code ?
void main()
{ fork(); fork(); printf("HELLO\n,,); fork();
printf("WELCOME\n”); }
How many times HELLO and WELCOME will be printed? Justify your answer.
(6 marks)
3. Which are the three methods used to pass parameters to operating system?.
(3marks)

Group 3:

1. List and explain the different access methods for files. (4 marks)
2. Describe linked and indexed allocation methods for files with the help of
neat
diagrams. (10 marks)

Group 4:
1. Describe the general scheme of using three classifications of users in
connection
with file access control with the help of an example. (5 marks)
2. How many times will ‘Forked’ get printed by the below code and justify
your
answer.
int main() {
fork();
fork();
printf("Forked\n");
return 0;} (3 marks)

Group 5:

1. Define seek time, rotational latency and disk bandwidth of disks.+. (3


marks)
2. Explain FCFS, SSTF and SCAN disk scheduling algorithms, using the given
disk queue of requests: 82,170,43,140,24,16,190. Find the total seek time for
each case. Assume that, the disk has 200 cylinders ranging from 0 to 199 and
3. the current position of head is at cylinder 50. (9 marks)

Group 6:

1. Suppose that a disk drive has 200 cylinders numbered from 0 to 199 and
the current position of the head is at cylinder 100. For the given disk
queue of requests: - 20,89, 130, 45, 120 and 180, draw the head
movement in FCFS, SSTF, CSCAN disk scheduling algorithms and
compute the total head movements (in cylinders) in each. (9 marks)
2. Point out the significance of Zero capacity queue in IPC? (2 marks)
Group 7:

1. Different users may need different types of access to a file or directory.


Explain the most general scheme to implement identity dependent access. (4
marks)
2. Explain indexed allocation method with an example. (5 marks)
3. Write notes on disk formatting. (3 marks)
4. Explain two level directory structure with the help of a diagram. (3 marks)

Group 8:

1. Compare sequential access and direct access methods of storage devices.


(3 marks)
2. Explain the different directory structures used in file system.(10 marks)
3. Suppose that a disk drive has 200 cylinders numbered from 0 to 199 and
the current position of the cylinder is at position 100.For the given queue
of requests:20,89,130,45,120 and 180.Draw the head movement in FCF
S,SSTF and CSCAN disk scheduling algorithms and calculate the total
head movements(in cylinders) in each.

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