File Name: industrial automation interview questions and answers .zip
This is an era of technology and everyone relies on technology. Technology has changed mankind a lot.
List any four objectives of process control. Suppressing the influence of external disturbances, Optimizing the performance, Increasing the productivity, Cost effective. What is closed loop?
Looking for industrial automation engineer jobs? Then wisdom jobs will give you complete idea about your job and also supplies with frequently asked interview questions that enables you to face the interview without any fear.
Industrial automation engineer design, program, simulate and test automated machinery and processes in order to complete the tasks. As an industrial automation engineer you need to work in automobile industries or food processing plants where you have to tackle with robots or machines which are used to perform specific tasks. This position demands strong communication skills and excellent manual dexterity. As industries are in huge demand with automation engineers, excel the interview session by stepping into industrial automation engineer job interview questions and answers given in the site.
Question 1. What Is Automation? Question 2. Answer : The components of automation system include. Question 3. Question 4. Explain Pid Based Control System? The PID controller takes care of closed loop control in plant. A number of PID controller with single or multiple loop can be taken on network.
PID Controllers are widely for independent loops. Although some logic can be implemented but not much of sequential logic can be implemented in PIDs. Question 5. Answer : PLC can be programmed whereas a relay cannot. Modifications in relay base circuit is difficult compared to PLCs. Question 6. Answer : DCS: The system uses multiple processors, has a central database and the functionality is distributed.
That is the controller sub system performs the control functions, the history node connects the data, the IMS node gives reports, the operator station gives a good HMI, the engineering station allows engineering changes to be made.
DCS is often used in the big plants where the redundancy level needed is more and the analog input used are high. Question 7. The RAM acts as memory. Hard disk is used as storage device.
Currently this systems are very useful when the large data is to be proceed with very high speed. In many cases for greater accuracy we can use the real-time operating system.
Answer : A feedback device which converts mechanical motion into electronic signals. Usually an encoder is a rotary device that outputs digital pulses which correspond to incremental angular motion. The encoder consists of a glass or metal wheel with alternating clear and opaque stripes that are detected by optical sensors to produce the digital outputs. Question 9.
Answer : The leading PLC providers include. Question Answer : The leading DCS providers include. What Is Transmitter? Answer : A transmitter is an electronic device that is generally mounted in the field in close proximity to a sensor. The sensor also known as a transducer measures a physical variable such as temperature or pressure and outputs a very low level electronic signal.
The basic function of the transmitter is to provide the correct electrical power to turn on or excite the sensor then to read the low level sensor signal, amplify it to a higher level electrical signal and send that signal a long distance to a control or read-out device. Since low-level electrical signals do not transmit long distances with great accuracy, installing a transmitter generally gives a tremendous improvement in the accuracy of the information delivered to a larger control system.
Typically the output form the transmitter is mA or V. Answer : The V signal has tendency to drop because of line resistance. If the distance between sensor and input card is more the signal will not properly represent the field value. The mA will travel a long distance without dropping signal value.
Answer : With 0- 20 mA you can not distinguish between minimum field value and connection break. With mA, internal circuit can distinguish between connection break of minimum value. Normally when the value is minimum the transmitter will give you 4 mA while in case of connection breakage it will give 0 mA.
Answer : In 2 wire transmitter the power and signal are transmitted through same cable. In 3 wire transmitter the data signal and power are with respect to common ground. In 4 wire transmitter two wires for power supply and two for signals. Only current transmitters can be used as 2 wire transmitters. What Is Field Bus? Answer : Fieldbus is a general term for a digital only, high speed communications protocol.
The key attribute to Fieldbus communications is higher speed communications with the possibility of addressing multiple transmitters all on the same field wiring. The Foundation Fieldbus is a specific digital protocol that is often shortened to just be called Fieldbus. Other digital only communications such as Profibus are also Fieldbus protocols. What Is Actuator? Answer : In a closed-loop control system, the part of the final control element that translates the control signal into action by the control device.
An actuator is a component of a machine that is responsible for moving or controlling a mechanism or system. An actuator requires a control signal and a source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic or hydraulic pressure, or even human power. Explain Working Of Rtds? Answer : Resistance Temperature Device works on the principles that the resistance of the material changes as its temperature changes. Temperature is determined by measuring resistance and then using the RTD Resistance vs Temp characteristic to detect temperature.
Platinum is widely used in RTDs because of accuracy. PT means at 0 deg temp ohms resistance. A typical RTD consists of a fine platinum wire wrapped around a mandrel and covered with a protective coating glass or ceramic. Explain Working Of Thermocouple? Answer : Thermocouple consists of two strips or wires made up of different metals and joined at one end.
The temperature at that juncture induces an electromotive force emf between the other ends. As the temperature goes up the emf also increases. Through standard charts and tables the corresponding temperature can be found out.
The relationship between the thermocouple output and the temperature is quite non linear. Different metallurgies produce different outputs. What Is Cold Junction Compensation? Answer : The industry accepted standard for the temperature at open end is 0 deg C.
Therefore most tables and chart make the assumption that the temp at open end is 0 deg C. In industry the open ends are always at actual room temperature and not 0 deg C. Answer : The thermocouple work on broad temperature range ie — to Answer : No. Splitting to two devices may result in bad readings or loss of signal. Answer : Differential pressure meters Positive displacement Velocity meters. Answer : Suitable restriction placed in flow stream causes a differential pressure across it.
Answer : Process pressure is transmitted through isolating diaphragms and oil fill fluid to a sensing diaphragm. The sensing diaphragm is a stretched spring element that deflects in response to differential pressure across it. The displacement of the sensing diaphragm, a maximum deflection of0. Capacitor plates on both sides of the sensing diaphragm detect the position of the diaphragm. The transmitter electronics convert the differential capacitance between the sensing diaphragm and the capacitor plates into a two- wire, mA dc signal and a digital output signal.
What Is Control Valves? Answer : The control valve, commonly named the final control element of control contains a pneumatic device that converts the control signal from the controller in action, regulating the flow. A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller.
This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level. Answer : Following specifications are used for control valve:. What Is Flow Coefficient?
C through the valve at full lift in U. S gallon per minute with a pressure drop across the valve of 1 psi. Popular Interview Questions. All Interview Questions.
Programmable Logic Controller is a class of industrially hardened devices which acts as an interface for input and output sensors. PLC has an important role when it comes to automation. All tasks related to monitoring and control actions are taken care by PLCs. The main job of PLC is to sense input through modules, process the logic through CPU and memory should be providing a necessary output through output modules. It is true that every interview is different as per the different job profiles. Here, we have prepared the important PLC Interview Questions and Answers which will help you get success in your interview. These interview questions are divided into two parts are as follows:.
And Answers In this file, you can ref interview materials for automation such as, automation situational interview, automation behavioral interview, automation phone inter… Rockwell Automation interview details: interview questions and interview reviews posted The whole thing was non-technical Answer Question. Dec 30, Draw detailed block diagram. Use the S. The acronym stands for: Situation, Task, Action, Result. Find the right reps for your company with these sales interview questions.
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