Top 1. 00 Instrumentation Engineering Questions Answers Instrumentation Tools. List any four objectives of process control. Suppressing the influence  of external   disturbances,   Optimizing the performance, Increasing the productivity, Cost effective. Define process. Any system   comprised   of dynamic   variables   usually   involved in manufacturing and production operations. It is defines as a series of operations during which some materials are placed in more useful state. What is manipulated variable. It is a variable which is altered by the automatic control equipment so as to change the variable under and make it conform with the desired value. Define Controlled variable. It  is  the  quantity of control system which is directly measured and controlled. What do you mean by self regulation The output will move from one steady state to another for the sustained change in input. This means that for change in some input variable the output variable will rise until it reaches a steady state inflow   outflow. It is the tendency of the process to adopt a specific value of controlled variable for nominal load with no control operations. Why do we need mathematical modeling of process The physical equipment of the chemical process we want to control have not been constructed. Consequently we cannot experiment to determine how the process reacts to various inputs and therefore we cannot design the appropr iate control system. If the process equipment needs to be available for experimentation the procedure is costly. Therefore we need a simple description of how the process reacts to various inputs, and this is what the mathematical models can provide to the control designer. Name different test inputs. Step, Ramp, Impulse, Sinusoidal, Pulse inputs. Name a process giving inverse response. Drum boiler system, in which the flow rate of the cold feed water is increased by a step the total volume of the boiling water and consequently the liquid level will decreased for a short period and then it will start increasing. Define interacting system and give an example. Load changes in first process affects the second process and vise versa when both are connected in series nature is called interacting system. Eg. Two level tanks are connected in series. A tank operating at 1. TRA, RHQ1. 05. X5. X1. 0 4What is meant by non self regulation A system that grows without limit for a sustained change in input constant outflow or outflow independent of inflow condition. Best Amharic Books Pdf' title='Best Amharic Books Pdf' />Write any two characteristics of first order process modeling. The smaller the value of time constant the steeper the initial response of the system. A first order lag proce ss is self regulating the ultimate value of the response equal to Kp steady state gain of the process for a unit step change in the input. Distinguish between continuous process and batch process. A process in which the materials or work flows more or less continuously through a plant apparatus while being treated is termed as continuous process. The problem of continuous process is due to load changes. Best Amharic Books Pdf' title='Best Amharic Books Pdf' />A process in which the materials or work are stationary at one physical location while being treated is termed as batch process. Explain the function of controller. The element in a process control loop that evaluated error of the controlled variable and initiates corrective action by a signal to the controlling variable. What is the purpose of final control element Components of a control system such as valve is used to directly regulates the flow of energy or materials to the process. It directly determines the value of manipulated variable. Define Process control. It is the scheme that describes how much the manipulated variable should change inorder to bring the controlled variable back to the setpoint. Muzica De Descarcat Gratis Manele 2013. List the two types of process control. Direct process control      Controlled variable directly indicates the performance of the process Eg. Water heater system. In. Direct Process control the performance of the process. Controlled variable indirectly indicates Eg. Annealing. What is Servo operation and Regulatory operation. If the purpose of the control system is to make the process follow the changes in setpoint as quick as possible, then it is servo operation. What is mathematical modeling. Set of equations that characterize the process is termed as Mathematical Modelling. I celebrate myself, and sing myself, And what I assume you shall assume, For every atom belonging to me as good belongs to you. I loafe and invite my soul. Define an non interacting system. The dynamic behaviour one tank is affected by the other, but the reverse is not true, then it is non interacting system. Here the liquid heads are independent of each other. Define an interacting system. The dynamic behavior one tank is affected by the other, but the reverse is also true, then it is non interacting system. Here the liquid heads are dependent of each other. Mention two drawbacks of derivative actioni The output of controller is zero at constant error condition. It will amplify the noise present in the error signal. Hp Laserjet 1018 Drivers Free Download more. What are the steps involved to design a best controller Define appropriate performance criterion ISE, IAE, ITATE. Compute the value of the performance criterion using a P, PI, or PID controller with the best setting for the adjusted parameters Kp, Ti, Td. Select controller which give the best value for the performance criterion. Define proportional control mode. A controller mode in which the controller output is directly proportional to the error signal PKpepp. P controller output Kp Propotional gain, eperror in percent of variable range, P0 Bias. Foreign Service Institute Saudi Arabic Web site. Covers the urban Hijazi dialect. Textbook PDF and 51 audio lessons MP3. Scroll down to the thirdbottom set of. Define proportional band. Proportional band is def ined as the change in input of proportional controller mode required to produce a full scale change in output. Write the relation ship between proportional band and proportional gain. DNQHLV6_Y/hqdefault.jpg' alt='Best Amharic Books Pdf' title='Best Amharic Books Pdf' />The reciprocal of gain expressed as a percentage is called proportional band. Kp1. 00PBDefine offset. It is the steady state deviation error resulting from a change in value of load variable. Define error deviation It is the difference at any instant between the value of controlled variable and the set point. ES. P P. VSketch Pneumatic PI controller. Refer Curtis Johnson, Page No. Fig. 1. 0. 1. 7. Why is the electronic controller preferred to pneumatic controller Electronic signals operate over great distance without time lags. Electronic signals can be made compatible with digital controllers. Electronic devices can be designed to be essentially maintenance free. Intrinsic safety techniques eliminate electrical hazards. Less expensive to install. More energy efficient. Due to the above said properties electronic controllers are preferred to pneumatic controller. Explain the function of controller. The element in process control loop that evaluates error of the controlled variable and initiates corrective action by a signal to the controlling variable. Write any two limitations of single speed floating control. The present output depends on the time history of errors and such history is not known, the actual value of controller output floats at an undetermined value. If the deviation persists controller saturates at either 1. A list of collaboratively maintained study guides and strategies made available in over thirty languages. Articles cover every aspect of study and are formatted as. These tips for parents of first graders are also available as a onepage handout to download and print Reading tips in English 60K PDF Reading tips in Spanish. TEXTBOOK DONT JUST DO SOMETHING STAND THERE TEN PRINCIPLES FOR LEADING MEETINGS THAT MATTER PDF EBOOKS cavalier manua number talks. Rastafari Preliminary Notes on the H. I. M. Haile Selassie I Amharic Bible An. Information on the Remnant Army and Maria Divine Mercy Messages in languages of the world. Top 100 Instrumentation Engineering Questions Answers Collection. Dear Sir, Thank you so much for creating such a valuable site. I feel very great and thanks. A proverb from Latin proverbium is a simple and concrete saying, popularly known and repeated, that expresses a truth based on common sense or experience. Read online or download the latest issues of the Watchtower and Awake magazines and other items featured below. Listen to free audio books of our publications in. Sketch the input output characteristic of single speed floating controller. Refer Curtis Johnson, Page No. Fig. 9. 7. Why derivative mode of control is not recommended for a noisy process The series capacitor in the derivative controller will amplify the noise in the error signal.