operating systeem questions
Printed From: One Stop GATE
Category: GATE Technical Discussions
Forum Name: GATE CS
Forum Discription: General Technical Discussions, Queries, doubts etc. for GATE in CS.
URL: http://forum.onestopgate.com/forum_posts.asp?TID=536
Printed Date: 27Feb2025 at 3:30am
Topic: operating systeem questions
Posted By: manju
Subject: operating systeem questions
Date Posted: 22Feb2007 at 2:31pm
1) a certain moving arm disk storage with one head has following specifications:
No. of tracks / recording surface = 200
Disk rotation speed = 2400 rpm
Track storage capacity = 62500 is
What is the average latency time (assume the head can move from one track to another only by traversing the entire track ) and the transfer rate
a) 2.9 sec and 4.25 Mbits/sec b) 2.5 sec and 2.5 Mbits/sec c) 3.1 sec and 1.5 Mbits/sec d) 3.1 sec and 1.5 Mbits/sec
2) For each process Pi , i = 1, 2, 3, ……9 is coded as follows
Repeat
P(mutex)
{critical section}
forever.
The code for P10 is identical expect that it uses V(mutex) in place of p(mutex) . What is the largest number of processes that can be inside the critical section at any moment ?
a) 1 b) 2 c) 3 d) none of these
3) a high speed tape system accommodates 2400 ft reel of standard track tape. The tape is moved fast at the rate 150 inches / sec.
i ) What must be the linear tape recording density in order to achieve a data transfer rate of 106 bit/sec.
a) 6667 bpi b) 4096 bpi c) 6196 bpi d) 8192 bpi
ii) If tape is organized into blocks of 32 Kb, a gap of 0.4 inches separates the blocks, what is the storage capacity of the tape
a) 16 MB b) 16.4 MB c) 8 MB d) 23.2 MB
4) The functionality of automatic TEST-AND-SET assembly language instruction is given by the following ‘C’ function?
Int TEST-AND-SET(int *x)
{
int y;
a1 : y = *x;
a2 : *x = 1;
a3 : return y;
}
C functions for implementing code for entering and leaving critical section based on the above TEST-AND-SET instruction.
Int mutex = 0;
Void enter-cs()
{
while( (1) );
}
void leave-cs()
{
(2);
}
What is values of (1) and (2)?
a) TEST-AND-SET(mutex) , mutex = 0;
b) TEST-AND-SET(mutex) , mutex = 1;
c) TEST-AND-SET(mutex) , mutex = 0;
d) TEST-AND-SET(mutex) , mutex = 1;
5 ) In a cache-organized memory there exists 30% of compulsory misses, 20% capacity misses, 12% conflict misses. If the cache is full associative, find the average access time? (t(c) = 19ns , t(m) = 100ns)
a) 10ns b) 40 ns c) 30 ns d) 62 ns
6) What is the hit-ratio for this code in a direct-mapped write back , write allocate data cache with cache size 32 KB and block size 16 KB?
a) 2/3 b) 5/6 c) 3/4 d) 7/8
7) Consider a disk having 8 surfaces, each surface is having an outer diameter of 16 cm and inner diameter of 6 cm, inner track space is 0.2 mm . There are 32 sectors in each track. If the disk address for reading a byte of a sector on any surface track of the disk is 27 bits.
i) What is the sector size?
a) 2 KB b) 4 KB c) 512 KB d) 256 KB
ii) If the above disk rotates at 3600 rpm, what is the effective data transfer rate in bytes/sec?
a) 4 MB/sec b) 3.5 MB/sec c) 3.8 MB/sec d) None
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Replies:
Posted By: balu
Date Posted: 22Feb2007 at 2:33pm
Here , I find the average Latency Time ., It 's (60 / 2400) = 0.025 = 2.5..
so ,the answer will be option (b).....
But , I am little bit Suspect abt the Transfer time ,
According to equation = (60/2400)*(62500/200) , Which is Not match WIth the option (b).
pls Give me , What is the possible Transfer time Equation...
I am littl;e bit Suspect abt the Option (b) option ..
Is it Right or Wrong ?
pls Verift It..
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