Automation Engineer TOP 20 Interview questions | Get PLC SCADA Job | PLC Fresher Job | PART 1

Automation Engineer Interview questions , Get PLC SCADA Job, PLC Fresher Job, Top Question
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QUESTION 1
What is Automation?
Automation is delegation of human control functions to technical equipment for increasing productivity, better quality, reduces cost & increased in safety working conditions.
QUESTION 2
What are the different components used in automation?
The components of automation system include
(1) Sensors for sensing the input parameters
(2) Transmitters for transmitting the raw signal in electrical form
(3) Control system which includes PLC, DCS & PID controllers
(4) Output devices, actuators like drives, control valves
QUESTION 3
What are the different control systems used in Automation?
(1) PID Controller based control system
(2) PLC based control system
(3) DCS based Control system
(4) PC Based Control system
QUESTION 4
Explain PID based control system
PID (Proportional Integral Derivative) is the algorithm widely used in closed loop control. The PID controller takes care of closed loop control in plant.
A number of PID controllers with single or multiple loop can be taken on network. PID Controllers are widely used for independent loops. Although some logic can be implemented but not much of sequential logic can be implemented in PIDs.
QUESTION 5
What is Difference between PLC & Relay?
(1) PLC can be programmed whereas a relay cannot.
(2) PLC works for analog I/Os such a PID loops etc. whereas a relay cannot.
(3) PLC is much more advanced as compared to relay
QUESTION 6
What is Difference between PLC & DCS?
(1) Response Time
PLCs are quick, that create the PLC a perfect controller for time period actions like a safety ESD (Emergency shutdown)) or firing control.
A DCS takes for much longer time to process information that created it not the proper resolution once response times are important.
(2) Scalability
A few thousand I/O points will be handled by a PLC whereas DCS will handle several thousands of I/O points and accommodate new instrumentation, process enhancements, and data integration.
DCS will be most popular once advanced process control is needed and contain an outsize facility that’s displayed over a large geographical region with thousands of I/O points.
(3) Complexity
The advanced process control capabilities of the DCS are needed to hold out the complicated nature of the many continuous production processes like oil and gas, water treatment and chemical process
QUESTION 7
What is Encoder?
Encoder is a feedback device which converts mechanical motion into electronic signal. 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 8
What types of sensors are used for measuring different parameters?
(1) Temperature sensors - RTD, Thermocouple, Thermister
(2) Pressure Sensors - Borden Tube, Bellows, Strain gauge
(3) Flow Sensors - Flow orifice, Flow Nozzle, Ventury Tube, Pitote tube
(4) Level Sensor
(5) Density Sensor
QUESTION 9
What is transmitter?
Transmitter is an electronic device that is generally mounted in the field close 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.
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