Interview Questions : Process control Engineer

Q)What does PID mean? (Be specific, don’t just define the Three Letter Acronym) Q)PID is normally used for three-mode control. What does this mean? Q)What is meant by the term setpoint? Q)What is a cascade loop? Q)What is a single loop controller? Q)Discuss the interrelationship between SP, PV and Output. Q)What is a marshalling panel? Q)What is the difference between points and tags? Q)In process control, what is the function of a transmitter? Q)What is meant by the term 4 to 20? Q)What is an RTD? Q)In process control, what do the abbreviations, AI, AO, DI and DO typically stand for? Q)What is a closed-loop system? Q)What is a thermocouple and how does it work? Q)Discuss the difference between a servo motor and a stepper motor Q)What is an actuator? Give an example of an actuator: Q)Describe the function of a controller Q)What is the difference between a batch process and a continuous process? Q)What is a controlled variable? Q)What is an A/D converter Q)What do we mean when we say a loop needs to be tuned?