Define real time operating system. List its any four applications of it.

1 Answer

Answer :

Real time Operating System:

A real time system has well defined fixed time constraints. Processing should be done within the defined constraints -Hard and Soft real time system.

OR

The real-time operating system used for a real-time application means for those applications where data processing should be done in the fixed and small quantum of time.

Types of real time operating system

1. Hard real-time

2. Soft real-time

Applications:

1. Flight Control System

2. Simulations

3. Industrial control

4. Military applications

Related questions

Description : List any four features of open source operating system.

Last Answer : 1. Open Source: open source OS code is freely available and it is community based development project. Multiple team's works in collaboration to enhance the capability of operating system and it is ... issuing a command in Linux Terminal or Shell. Linux can also run Windows applications if needed.

Description : Enlist the operating system tools. Explain any two in detail.

Last Answer : Following are the operating tools: User Management Security policy Device Management Performance Monitor Task Scheduler A) User management: User management includes everything ... routing tables, interface statistics, masquerade connections, and multicast memberships. # netstat -tulpn

Description : Enlist types of operating system. Explain multiprogramming OS in detail.

Last Answer : Types of operating system 1.Batch Systems 2.Multiprogramming 3.Multitasking 4.Time-Sharing Systems 5.Desktop Systems 6.Distributed system 7.Clustered system 8.Real Time system: Multiprogramming ... multiprogramming: user can open word, excel, access and other applications in a system.

Description : List free space management techniques? Describe any one in detail.

Last Answer : A file system is responsible to allocate the free blocks to the file therefore it has to keep track of all the free blocks present in the disk. There are mainly four approaches by using which, the free ... block. This block contains a pointer to the next free disk block, and so on.

Description : Write Unix command for following: i)create a folder OSY ii) create a file FIRST in OSY folder iii) List/display all files and directories. iv) Write command to clear the screen

Last Answer : i) create a folder OSY: $mkdir OSY ii)create a file FIRST in OSY folder: $cd OSY $cat>FIRST or $ touch FIRST iii) List/display all files and directories: $ls iv) to clear screen: $clear

Description : List components of OS. Explain process management in detail.

Last Answer : List of System Components: 1. Process management 2. Main memory management 3. File management 4. I/O system management 5. Secondary storage management Process Management: The operating ... synchronization. 4. A mechanism for process communication. 5. A mechanism for deadlock handling.

Description : Define virtual memory

Last Answer : Virtual memory is a memory management capability of an operating system (OS) that uses hardware and software to allow a computer to compensate for physical memory shortages by temporarily transferring data ... can be placed in overlays, but can concentrate instead on the problem to be programmed. 

Description : Describe any four file attributes

Last Answer : File attributes: Name: The symbolic file name is the only information kept in human readable form. Identifier: File system gives a unique tag or number that identifies file within file ... Last modification and last use. These data can be useful for protection, security and usage monitoring.

Description : Explain any four scheduling criteria.

Last Answer : 1. CPU utilization: In multiprogramming the main objective is to keep CPU as busy as possible. CPU utilization can range from 0 to 100 percent. 2.Throughput: It is the number of processes ... fairly early and can continue computing new results while previous results are being output to the user.

Description : What is purpose of system call? State two system calls with their functions.

Last Answer : System call provides an interface between a running program and operating system. It allows user to access services provided by operating system. This system calls are procedures written using C, ... send, receive messages transfer status information attach or detach remote devices. 

Description : Explain partitioning and its types.

Last Answer : An important operation of memory management is to bring programs into main memory for execution by the processor. Partitioning is a technique that divides a memory into multiple partitions. These partitions ... in memory. For example: Consider following table with process and memory space.

Description : Enlist different file allocation methods? Explain contiguous allocation method in detail.

Last Answer : From the user's point of view, a file is an abstract data type. It can be created, opened, written, read, closed and deleted without any real concern for its implementation. The implementation of a ... a times is difficult to estimate. 4. Compaction may be required and it can be very expensive.

Description : Explain LRU page replacement algorithm for following reference string. 7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1 Calculate the page fault.

Last Answer : LRU: The Least Recently Used (LRU) page replacement policy replaces the page that has not been used for the longest period of time. LRU replacement associates with each page the time of that page's last use. ... in question so assume frame size as 3 or 4) LRU: Assume frame size=3

Description : Explain multithreading model in detail.

Last Answer : Many systems provide support for both user and kernel threads, resulting in different multithreading models. Following are three multithreading model: Many-to-One Model The many-to- ... True concurrency cannot be achieved. Multiple threads of kernel is an overhead for operating system

Description : Explain PCB with diagram.

Last Answer : Each process is represented as a process control block (PCB) in the operating system. It contains information associated with specific process. Process State: It indicates current state of a process. ... . Each PCB gives information about a particular process for which it is designed.

Description : Explain Round Robin algorithm with suitable example.

Last Answer : It is preemptive scheduling algorithm. A small unit of time known as a time quantum or time slice is used for pre-emption of a currently running process. Ready queue is implemented as a circular ... has received 1 time quantum, the CPU returns to process P1 for an additional time quantum. 

Description : State and describe types of scheduler.

Last Answer : There are three types of scheduler: Long term scheduler Short term scheduler Medium term scheduler 1. Long term scheduler: It selects programs from job pool and loads them into the ... scheduler works in close communication with long term scheduler for loading process into the main memory. 

Description : Describe sequential and direct access method.

Last Answer : Sequential access: Information from the file is processed in order i.e. one record after another. It is commonly used access mode. For example, editors and compilers access files in sequence. A read ... prevent the user from accessing portions of the file system that may not be part of his file.

Description : Explain deadlock? What are necessary conditions for deadlock?

Last Answer : In multiprogramming environment, several processes may compete for a finite number of resources. A process requests resources and if the resources are not available then the process enters into the ... Each process is waiting for the resources held by other waiting processes in circular form.

Description : Describe I/O Burst and CPU Burst cycle with neat diagram.

Last Answer : CPU burst cycle: It is a time period when process is busy with CPU.  I/O burst cycle: It is a time period when process is busy in working with I/O resources. A process execution consists ... cycle and so on. The final CPU burst cycle ends with a system request to terminate execution.

Description : With neat diagram explain inter process communication model.

Last Answer : Inter-process communication: Cooperating processes require an Interprocess communication (IPC) mechanism that will allow them to exchange data and information. There are two models of IPC 1. ... a communication link between them. Between each pair of processes exactly one communication link.

Description : Write syntax for following commands: i)Sleep ii)Kill

Last Answer : i)sleep Syntax: sleep NUMBER[SUFFIX]… sleep OPTION ii) kill Syntax: kill pid

Description : Draw process state diagram.

Last Answer : process state diagram

Description : Explain any 4 services provided by OS.

Last Answer : 1.User Interface: All operating systems have a user interface that allows users to communicate with the system. Three types of user interfaces are available: a. Command line interface ( ... to system resources. Security is provided by user authentication such as password for accessing information.

Description : Explain the operating principle of LASER and list applications of LASER diode.

Last Answer : A basic construction of Laser diode is as shown . A PN junction is formed by two layers of doped gallium arsenide. There is highly reflective surface at one end of PN junction and ... 6. laser scanning and light beam illumination. 7. Military applications 8. Medical surgery 9.Diamond cutting

Description : List any four applications of Air Braking System.

Last Answer : Applications of Air Braking System: (1) Trucks. (2) Buses. (3) Trailers (4) Semi Trailers (5) Railway Train. 

Description : State the working principle of Cam. List its types. Give any four applications of Cam.

Last Answer : Working principle of CAM: A cam is mechanical rotating machine element which is used for converting one motion in to another. It is rotating machine element that gives reciprocating or ... control mechanisms. Spinning and weaving machineries. Textile machineries. Paper cutting machines.

Description : List four applications of a transformer.

Last Answer : It can raise or lower the voltage or current in an AC circuit. It can act as an impedance transferring device by increasing or decreasing the value of a capacitor, inductor or resistance in an ... two circuits electrically. It can be used to prevent DC from passing from one circuit to another

Description : List any four applications of diesel power plant.

Last Answer : 1. Used as peak load plants 2. Suitable for mobile plants 3. Used as standby units 4. Used as emergency plant

Description : List any four applications of Irrigation engineering

Last Answer : The applications of irrigation engineering are: 1. Construction of dams, canals, spillways etc. 2. Supplying Water for Agriculture, Drinking Etc. 3. Irrigation engineering also deals with the ... during the periods of less rainfall or during summer when water is not available in abundance

Description : List four applications of CRO.

Last Answer : Applications of CRO: 1. It is used in laboratory for measurement of AC/DC voltage, current, frequency, phase and study nature of waveform. 2. It is used in TV receiver for creation of ... modulation percentage of modulated wave. 10. It is also used to check radiation pattern generated by antenna.

Description : List four applications of digital multimeter.

Last Answer : Applications : 1. It is used continuity test. 2. It is used to check diode 3. It is used to check transistor 4. It is used to measure voltage, current & resistance.

Description : List any four applications of laser diode.

Last Answer : 1. As light source in fiber optic communication. 2. In the infrared spectrometers. 3. In the medical field. 4. In military applications. 5. To measure distance, alignment angle etc. 6. For flow ... . 9. For welding. 10. For sound recording and reproduction (in CD players) 11. In holography.

Description : List any four applications of forging process. 

Last Answer : Applications of Forging Process: 1. Connecting rod 2. Crankshaft 3. Camshaft 4. Spanner 5. Alloy wheel 6. Differential gears 7. Drive shafts 8. Clutch hubs 9. Universal joints 10. Hand Tools

Description : List out any four applications of lapping and buffing.

Last Answer : Applications of Lapping:  A. Hand lapping is used for i. Press work dies ii. Moulding dies iii. Limit gauges iv. Surface plates v. Engine valve and valve seat B. ... , bicycles, sporting items, tools, store fixtures, commercial and residential hardware and household utensils and appliances. 

Description : State the principle used in Lapping. List four applications of Lapping.

Last Answer : Principle of Lapping: Lapping is basically an abrasive process in which loose abrasives function as cutting points finding momentary support of the lap. The process has the following features. (a) Use of ... roller bearings ii. Gears iii. Piston rings iv. Slip gauges v. Crankshaft.

Description : List any four applications of computer graphics.

Last Answer : DTP (Desktop Publishing) Graphical User Interface (GUI) Computer-Aided Design Computer-Aided Learning (Cal) Animations Computer Art Entertainment ... Image processing Medical Applications Presentation and Business Graphics Simulation and Virtual Reality

Description : List any four applications of ‘cam’ and ‘follower’.

Last Answer : Applications of Cam and Follower: [1] Operating the inlet and exhaust valves of internal combustion engines [2] Used in Automatic attachment of machineries, paper cutting machines [3] Used in Spinning ... control mechanism [7] Used in wall clock [8] Used in feed mechanism of automatic lathe.

Description : List any four applications of insulting material used in electrical fields. 

Last Answer : Applications of insulting material used in electrical fields: 1. In Electrical machines 2. In electrical transformers. 3. Transformer bushing 4. Insulators 5. Domestic equipment’s ( or any other equivalent applications) 6. Insulation on wires and cables 

Description : List special features  of isolation transformer with any four applications.

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Description : List out the four applications of diesel electric power plant.

Last Answer : Applications of Diesel Power Plant: 1. It can be used as a standby (emergency) power plant to maintain continuity of supply. (Incase failure of main supply like hospital, Telephone exchange Radio stations, ... 10. Diesel plants are widely used for generating power ranging from 100 to 5,000 H.P.

Description : List any four applications of function generator.

Last Answer : Applications of function generator: 1. To test the bandwidth of audio frequency amplifier. 2. Used for troubleshooting of different analog and digital circuits. 3. Acts as source for alignment of receivers 4. For generation of different waves.

Description : List four applications of LED.

Last Answer : Applications of LED 1.As a power supply status indicator in electronics instruments 2.In traffic light Indicators. 3.In data displaying boards. 4.In medical applications and toys 5.In optical fiber communications 6.Remote controls

Description : Define counter. State four applications of counter.

Last Answer : Counter - The circuit which counts number of clock pulses is called as counter. Applications - Processor Real time clock Calculator Batch counter

Description : Windows is an operating system that lets you use different types of applications or softwares. -Technology

Last Answer : TrueWindows allows us to use a Word processing application to write a letter. It also lets you to use different types of applications or softwares.

Description : Is there any way to recover applications lost by reformat of the operating system

Last Answer : No. You can only undo the reformat. You should always save everything to a backup cd or back up storage device before reformatting an operating system.

Description : A computer software that provide the services to software applications beyond those available from the operating system is called A : Sensor B : Middleware C : Actuator D : Transducer

Last Answer : B : Middleware

Description : A computer software that provide the services to software applications beyond those available from the operating system is called A : Sensor B : Middleware C : Actuator D : Transducer

Last Answer : B : Middleware

Description : A computer software that provide the services to software applications beyond those available from the operating system is called A : Sensor B : Middleware C : ActuatorD : Transducer

Last Answer : B : Middleware

Description : ____ software creates a mirror image of the entire hard disk, including the operating system, applications, files and data. a) Operating system b) Backup software c) Utility programs d) Driver imaging e) None of these

Last Answer : b) Backup software