Process Dynamics & Control

Use this for “A process has damping ratio 0.3 and natural frequency 0.5 per min. Find its overshoot, decay ratio and period.”

Use this for “A 2000 L stirred tank is fed 100 L/min. What is its time constant?”

Use this for “Which part of a PID controller removes the offset, and which one amplifies noise?”

Use this for “Should the steam valve to a reboiler fail open or fail closed if the instrument air is lost?”

Use this for “A process has K = 2, τ = 10 min and θ = 2 min. Find IMC PI settings for τc = 4 min.”

Use this for “After a step, the output makes 28.3% of its change by 4 min and 63.2% by 10 min. Find τ and θ.”

Use this for “Is the loop with characteristic equation s³ + 6s² + 11s + 6 = 0 stable?”

Use this for “A feed-flow disturbance has gain Kd = 1.5 and the process Kₚ = 3. What feedforward gain cancels it?”

Use this for “A reactor’s temperature controller sets the jacket temperature controller’s setpoint. Which control structure is this?”