OPEREATING SYSTEM
TIME: 3 HOURS
Max.
Marks: 100
Answer all questions
PART-A (10 X 2 = 20 Marks)
1. Define
an Operating System?
2. What
is a micro kernel based operating system?
3. What
is the meaning of the term busy waiting?
4. Define
the term critical section.
5. What
is address binding?
6. Why
CPU scheduling is required?
7. Define
Seek time.
8. List
any four objectives of file management system.
9. Differentiate
Location transparency and Location
independence?
10. List
out the advantages of Cache Location?
PART-B (5 X 4 = 20 Marks)
11 a) Write
about time sharing operating systems
(OR)
11 b) Why
does a machine need dual mode operation. Explain with an example.
12 a)
Define ‘Co-operating process’? With an
example
(OR)
12 b) Write a short note on: semaphores
13 a) Differentiate among the following terminologies.
i.
Global and local allocation (2 marks)
ii.
Equal and proportional allocation (2 marks)
(OR)
13 b) What is fragmentation? Explain its type and disadvantages.
14 a) Briefly
explain how disk reliability is carried out.
(OR)
14 b) Explain
the file system structure?
15 a) List out any four differences between
Caching and Remote Service.
(OR)
15 b) What is Token-Passing Approach?
Explain
PART – C (5
x 12 = 60 marks)
16.a) Distinguish among
the following terminologies associated with the operating system and explain each of them in detail.
i)
Multiprogramming systems (4
marks)
ii)
Multitasking systems (4 marks)
iii)
Multiprocessor systems
(4 marks)
(OR)
16. b) (i)what is the difference between a hard real time
system and a soft real time system ?
(ii) What are the main difference between
operating system for main frame and
personal computers?
17 a) Define
deadlock. List and elaborate the necessary condition for deadlock to
occur?
(OR)
17 b) (i) Explain process states with a diagram. What is the need for a
context switch? (6 marks)
(ii)Differentiate
between short term, medium term and long term schedulers. (6 marks)
18 a) i).For the
following set of process find the average waiting time using Gantt chart for
a)
SJF
(4 marks)
b)
Priority scheduling (4 marks)
Process
|
Burst time
|
Priority
|
P1
|
5
|
5
|
P2
|
3
|
4
|
P3
|
8
|
3
|
P4
|
2
|
1
|
P5
|
1
|
2
|
The process have
arrived in the order P2, P1, P4, P3 and P5.
ii) Explain the different type of
CPU Schedulers. (4 marks)
(OR)
18b) Explain the demand paging system of implementing virtual memory.
19.a) Calculate total
number of head movement . suppose the
disk request queue contains set of references for blocks 76,124,17,269,201,29
and 137.
i.
FCFS
(4 marks)
ii.
SSTF
(4 marks)
iii.
SCAN
(4 marks)
(OR)
19 b) Explain
different disk scheduling techniques with examples. How are their performance
measured?
20 a) Define Naming and
Briefly explain the Naming
and Transparency.
(OR)
20b) i) Briefly explain
the Stateful versus Stateless
Service? (6 marks)
ii) Describe briefly about Concurrency Control With an
example (6 marks)
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