Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III PROCESS CONTROL INSTRUMENTATION Previous Question Paper (December - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What are the process control variables?
Answer
Process control variables include the controlled variable (the parameter being maintained at a setpoint), the manipulated variable (the input adjusted by the controller to influence the process), and load disturbances (uncontrolled inputs that affect the process output).
Distinguish between servo and regulator operation of control system.
Answer
In servo operation, the control system is designed to track a frequently changing setpoint (e.g., a robotic arm following a trajectory). In regulator operation, the system is designed to maintain a constant setpoint despite the presence of external load disturbances (e.g., a furnace temperature controller).
What is meant by single speed floating control?
Answer
Sign in to view the complete answer paper.
Design an electronic p-controller with a proportional gain.
Answer
Sign in to view the complete answer paper.
Explain about controller tuning.
Answer
Sign in to view the complete answer paper.
Explain why it is necessary to choose controller settings that satisfy both gain margin and phase margin.
Answer
Sign in to view the complete answer paper.
What is pneumatic actuator? What are different types of pneumatic actuator?
Answer
Sign in to view the complete answer paper.
Explain about valve positioned.
Answer
Sign in to view the complete answer paper.
Briefly explain about multivariable control.
Answer
Sign in to view the complete answer paper.
State the conditions for the cascade control to be effective.
Answer
Sign in to view the complete answer paper.
Part B
Derive the mathematical model for interacting process.
Answer
Sign in to view the complete answer paper.
With a neat schematic diagram explain about batch process and continuous process.
Answer
Sign in to view the complete answer paper.
Explain the flow process with the mathematical model.
Answer
Sign in to view the complete answer paper.
Define self-regulation and describe it with an example.
Answer
Sign in to view the complete answer paper.
Explain the procedure for tuning PI controller using zielger Nicholas method.
Answer
Sign in to view the complete answer paper.
Derive and comment on the responses of a PID controller for a ramp and impulse Inputs.
Answer
Sign in to view the complete answer paper.
Explain how to find the controller settings using process reaction curve.
Answer
Sign in to view the complete answer paper.
Discuss the procedure for setting controller parameters using frequency response method.
Answer
Sign in to view the complete answer paper.
Explain the procedure for tuning the controller settings by damped oscillation method.
Answer
Sign in to view the complete answer paper.
What is the use of evaluation criteria? Explain ISE.
Answer
Sign in to view the complete answer paper.
Explain the occurrence of cavitations and flashing in control valve.
Answer
Sign in to view the complete answer paper.
Explain the principles of working and construction of I/P converter.
Answer
Sign in to view the complete answer paper.
Explain the feed forward control with an example. Compare this with feedback control. Also bring out this merits and demerits.
Answer
Sign in to view the complete answer paper.
With a neat block diagram explain the operation of split range control scheme.
Answer
Sign in to view the complete answer paper.