4. Food Processing and Engineering

Process Control — Quiz

Test your understanding of process control with 5 practice questions.

Practice Questions

Question 1

Using the Ziegler–Nichols closed-loop tuning method, a food pasteurization system exhibits sustained oscillations when the proportional gain is set to $K_u=4.0$ and the oscillation period is $P_u=6.0\,\mathrm{s}$. What are the recommended initial PID tuning parameters ($K_p$, $T_i$, $T_d$)?

Question 2

For a thermal mixing process with significant transport delay, which advanced control strategy uses an internal process model to compensate for dead time?

Question 3

A snack packaging line inspects batches of 120 units each and finds an average of 4 defective units per batch. Using a $p$-chart, what is the upper control limit (UCL) for the proportion of defectives?

Question 4

What is the primary advantage of cascade control in a multi-stage cooking process compared to single-loop PID control?

Question 5

A flow sensor calibration curve deviates increasingly from the true flow at higher rates, causing curvature in its response. What type of sensor error is this?