CHE 421 Control System Quiz

What is the main purpose of a control system?

• A) Increase energy use

• B) Reduce system complexity

• C) Regulate or maintain a variable at a desired value

• D) Enhance user interface

In a closed-loop control system, what element compares the measured output with the set point?

• A) Controller

• B) Sensor

• C) Comparator

• D) Process

Which of the following components adjusts the manipulated variable in response to the controller’s signal?

• A) Measuring element

• B) Final control element

• C) Comparator

• D) Process

The type of feedback that ensures error is minimized by reducing the difference between set point and measured variable is:

• A) Open loop

• B) Neutral feedback

• C) Positive feedback

• D) Negative feedback

What is the major disadvantage of positive feedback in control systems?

• A) Oscillations

• B) High cost

• C) Stability issues

• D) Increased accuracy

What does the “set point” represent in a control system?

• A) The maximum value of the output

• B) The measured output

• C) The desired value of the controlled variable

• D) The error signal

The component responsible for detecting the controlled variable is:

• A) Controller

• B) Actuator

• C) Measuring element

• D) Comparator

The deviation variable is defined as:

• A) Absolute difference between input and output

• B) Change from a reference steady state

• C) Root mean square of error

• D) Average system output

What type of control problem involves a changing set point?

• A) Regulator

• B) Servo

• C) Loop

• D) Cascade

Which actuator uses compressed air as the driving force?

• A) Hydraulic actuator

• B) Pneumatic actuator

• C) Solenoid

• D) Stepper motor