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DRIVE
Spring – 2017
PROGRAM
MASTER OF COMPUTER APPLICATION
SEMESTER
II
SUBJECT CODE & NAME
MCA211 – OPERATING SYSTEM
Set 1
Q1 Differentiate between
Sequential access and Direct access methods. 5+5
Answer.
Sequential
access and Direct access methods
Sequential access
In this simple
access method, information in a file is accessed sequentially one record after
another. To process the ith record all the i-1 records previous to i must be
accessed. Sequential access is based on the tape model that is inherently a
sequential access device. Sequential access is best suited where most of the
records in a file are to be processed. For example, transaction files.
Q2 Differentiate between Daisy
chain bus arbitration and Priority encoded bus arbitration. 5+5
Answer.
Daisy chain bus arbitration and Priority
encoded bus arbitration
There are many
ways of addressing the “bus arbitration” problem; three techniques which are
often implemented in processor systems are the following: Daisy chain
arbitration, priority encoded arbitration and distributed arbitration by
self-section. These are also often used to determine the
Q3.
Explain LRU page replacement algorithms with an example 4+6= 10
Answer:
LRU
page replacement algorithm
The main distinction
between FIFO and optimal algorithm is that the FIFO algorithm uses the time
when a page was brought into memory (looks back) whereas the optimal algorithm
uses the time when a page is to be used in future (looks ahead). If the recent
past is used as an approximation of the near
.
Set
2
Q1.
Define operating system. Explain any four major functions of operating system
2+8 = 10
Answer:
Operating System is a System Software (Set of system programs) which provides
an environment to help the user to execute the programs. An operating system
(OS) is a software program that manages the hardware and software resources of
a computer. A key component of system
Q2 Explain the different process
states. 5*2
Answer.
Different
process states
A program in execution is a
process. A process is executed sequentially, one instruction at a time. A
program is a passive entity.
Example: a file on the disk. A
process on the other hand is an active entity. In addition to program code, it
Q3 Define Deadlock. Explain
necessary conditions for deadlock. 2+(2*4)
Answer.
Deadlock
Deadlock occurs when we
have a set of processes [not necessarily all the processes in the system], each
holding some resources, each requesting some resources, and none of them is
able to obtain what it needs, i.e. to make progress. We will usually reason in terms
of resources R1, R2... Rm and processes P1, P2... Pn. A process Pi that is
waiting for some currently unavailable resource is said to be blocked.
System Model
The number of
resources in a
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