 |  Process Control 40 Flashcards |  Start |
 | What is the main objective of process control in chemical engineering? |  Card: 1 / 40 |
| To maintain process variables at desired values despite disturbances. | Card: 2 / 40 |
| True or False: The integral action in PID control eliminates steady-state error. | Card: 3 / 40 |
| True. It continues to adjust output as long as error exists. | Card: 4 / 40 |
| Fill in the blank: The transfer function is the ratio of the Laplace transform of the output to the _____ transform of the input. | Card: 5 / 40 |
| Laplace | Card: 6 / 40 |
| What is the damping condition for a critically damped system? | Card: 7 / 40 |
| Damping coefficient (ζ) equals 1. | Card: 8 / 40 |
| How does dead time affect control system performance? | Card: 9 / 40 |
| It complicates control and reduces achievable performance. | Card: 10 / 40 |
| What is the formula for the transfer function of a first-order system? | Card: 11 / 40 |
| G(s) = K / (τs + 1) | Card: 12 / 40 |
| Which control mode allows the operator to adjust the final control element directly? | Card: 13 / 40 |
| Manual control. | Card: 14 / 40 |
| Multiple Choice: What happens in an underdamped second-order system? | Card: 15 / 40 |
| A) No oscillation | Card: 16 / 40 |
| What is the relationship between process gain and output change? | Card: 17 / 40 |
| Process gain (Kp) is the change in output per unit change in input. | Card: 18 / 40 |
| Sequence: Arrange the following in order of controller actions: Derivative, Integral, Proportional. | Card: 19 / 40 |
| Proportional, Integral, Derivative. | Card: 20 / 40 |
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| What defines a stable control system? | Card: 21 / 40 |
| All roots of the characteristic equation must have negative real parts. | Card: 22 / 40 |
| What is the primary function of the final control element? | Card: 23 / 40 |
| To implement the controller output, typically a control valve. | Card: 24 / 40 |
| Comparison: What is the difference between feedback control and feedforward control? | Card: 25 / 40 |
| Feedback responds to deviations; feedforward anticipates disturbances. | Card: 26 / 40 |
| How would you use the Ziegler-Nichols method for PID tuning? | Card: 27 / 40 |
| Adjust gain until oscillations occur, then calculate parameters. | Card: 28 / 40 |
| Riddle: I can measure temperature but am not always accurate. What am I? | Card: 29 / 40 |
| A thermocouple. | Card: 30 / 40 |
| True or False: A higher controller gain always improves system performance. | Card: 31 / 40 |
| False. It can lead to instability. | Card: 32 / 40 |
| What is the typical range for the phase margin to ensure stability? | Card: 33 / 40 |
| Greater than 30 degrees. | Card: 34 / 40 |
| What strategy should be employed first in cascade control tuning? | Card: 35 / 40 |
| Tune the secondary loop first with the primary in manual. | Card: 36 / 40 |
| What are the primary components of a control system? | Card: 37 / 40 |
| Sensor, Controller, Final Control Element, Process. | Card: 38 / 40 |
| What is the effect of increasing the integral time in a PI controller? | Card: 39 / 40 |
| It reduces the integral action, potentially stabilizing the system. | Card: 40 / 40 |
| Completed! Keep practicing to master all of them. |  Restart |
