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Processes, Threads, Inter‐process communication, Concurrency and synchronization. Deadlock. CPU scheduling. Memory management and Virtual memory. File systems. Disks is also under this

$$\small{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count}&2&3&2&2&1&1&1&2&3
\\\hline\textbf{2 Marks Count}&4&3&2&2&4&3&3&3&4
\\\hline\textbf{Total Marks}&10&9&6&6&9&7&\bf{6}&\bf{7.8}&\bf{10}\\\hline
\end{array}}}$$

Recent questions in Operating System

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1
Write a program to implement multiple timers using a single clock. Input for this program consists of a sequence of four types of commands $(S<int> , T<int>, E<int> , P<int>): S<int> $ sets the current time to $<int>; T$ ... out the values of Current time, Next signal, and Clock header. Your program should also print out a statement whenever it is time to raise a signal.
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 32 views
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2
Write a program to implement the three disk-arm scheduling algorithms. Write a driver program that generates a sequence of cylinder numbers $(0–999)$ at random, runs the three algorithms for this sequence and prints out the total distance (number of cylinders) the arm needs to traverse in the three algorithms.
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 111 views
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4
A notebook computer is set up to take maximum advantage of power saving features including shutting down the display and the hard disk after periods of inactivity. A user sometimes runs UNIX programs in text mode, and at other times uses the $X$ Window System. She is surprised to find that battery life is significantly better when she uses text-only programs. Why?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 43 views
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1 answer
5
If a CPU's maximum voltage, $V,$ is cut to $V/n,$ its power consumption drops to $1/n^{2}$ of its original value and its clock speed drops to $1/n$ of its original value. Suppose that a user is typing at $1\: char/sec,$ but the CPU time ... value of $n$ and what is the corresponding energy saving in percent compared to not cutting the voltage? Assume that an idle CPU consumes no energy at all.
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 64 views
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1 answer
7
It has been observed that a thin-client system works well with a $1$-Mbps network in a test. Are any problems likely in a multiuser situation? (Hint: Consider a large number of users watching a scheduled TV show and the same number of users browsing the World Wide Web.)
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 42 views
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1 answer
8
A thin-client terminal is used to display a Web page containing an animated cartoon of size $400\: \text{pixels} \times 160\: \text{pixels}$ running at $10\: \text{frames/sec.}$ What fraction of a $100$-Mbps Fast Ethernet is consumed by displaying the cartoon?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 44 views
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9
In the text we gave an example of how to draw a rectangle on the screen using the Windows GDI: Rectangle(hdc, xleft, ytop, xright, ybottom); Is there any real need for the first parameter (hdc), and if so, what? After all, the coordinates of the rectangle are explicitly specified as parameters.
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 26 views
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10
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1 answer
11
Assuming that it takes $2\: nsec$ to copy a byte, how much time does it take to completely rewrite the screen of an $80\: \text{character} \times \text{25}$ line text mode memory-mapped screen? What about a $1024 \times 768$ pixel graphics screen with $24$-bit color?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 67 views
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1 answer
12
One way to place a character on a bitmapped screen is to use BitBlt from a font table. Assume that a particular font uses characters that are $16 × 24$ pixels in true RGB color. How much font table space does each character take? If copying a byte takes $100\: nsec,$ including overhead, what is the output rate to the screen in characters/sec?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 59 views
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13
The primary additive colors are red, green, and blue, which means that any color can be constructed from a linear superposition of these colors. Is it possible that someone could have a color photograph that cannot be represented using full $24$-bit color?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 16 views
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1 answer
14
The designers of a computer system expected that the mouse could be moved at a maximum rate of $20\: cm/sec.$ If a mickey is $0.1 \:mm$ and each mouse message is $3$ bytes, what is the maximum data rate of the mouse assuming that each mickey is reported separately?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 27 views
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1 answer
15
A user at a terminal issues a command to an editor to delete the word on line $5$ occupying character positions $7$ through and including $12.$ Assuming the cursor is not on line $5$ when the command is given, what ANSI escape sequence should the editor emit to delete the word?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 50 views
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1 answer
17
A bitmap terminal contains $1600$ by $1200$ pixels. To scroll a window, the CPU (or controller) must move all the lines of text upward by copying their bits from one part of the video RAM to another. If a particular window is $80$ lines high by $80$ characters ... baud rate of the terminal? Putting a character on the screen takes $5\: \mu sec.$ How many lines per second can be displayed?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 96 views
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1 answer
18
Many versions of UNIX use an unsigned $32$-bit integer to keep track of the time as the number of seconds since the origin of time. When will these systems wrap around (year and month)? Do you expect this to actually happen?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 95 views
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1 answer
19
A system simulates multiple clocks by chaining all pending clock requests together as shown in Fig. 5-30. Suppose the current time is $5000$ and there are pending clock requests for time $5008, 5012, 5015, 5029,4$ and $5037.$ Show the values of Clock header, Current ... pending) signal arrives at time $5017$ for $5033.$ Show the values of Clock header, Current time and Next signal at time $5023.$
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 117 views
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1 answer
20
A computer uses a programmable clock in square-wave mode. If a $500\:MHz$ crystal is used, what should be the value of the holding register to achieve a clock resolution of a millisecond (a clock tick once every millisecond)? $100$ microseconds?
asked Oct 28, 2019 in Operating System Lakshman Patel RJIT 232 views
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