Quiz on Automatic Control Methodologies

Which of the following is NOT a primary control methodology in automatic control systems?

• Feedback control

• Feedforward control

• Manual override control

• Optimal control

Optimal control refers to:

• A control strategy that minimizes energy consumption

• A control system designed to achieve the best performance under given constraints

• A system that only uses PID controllers

• A control method that ignores system disturbances

Feedback control systems are characterized by:

• Adjusting the control action based on the difference between desired and actual output

• Predicting disturbances before they affect the system

• Operating without any sensors

• Using only open-loop mechanisms

Feedforward control differs from feedback control in that it:

• Reacts to errors after they occur

• Compensates for disturbances before they affect the system

• Does not require any reference input

• Only works in manual control systems

On-Off control is best suited for systems that require:

• Precise and continuous adjustments

• Only two states (fully ON or fully OFF)

• Complex mathematical modeling

• Adaptive tuning of control parameters

Sequential control is commonly used in:

• Systems where operations follow a predefined step-by-step sequence

• Randomly varying processes

• Systems that only require proportional control

• Open-loop control systems without sensors

The main purpose of a PID controller is to:

• Provide a control signal based on proportional, integral, and derivative terms

• Only use integral action for steady-state accuracy

• Operate without any feedback mechanism

• Switch between ON and OFF states only

Program control refers to:

• A control system that follows a predetermined set of instructions

• A manual override system

• A system that does not require any automation

• A control method used only in electrical circuits

In ship propulsion machinery, automatic control systems are primarily used to:

• Maintain optimal engine performance and safety

• Replace human operators completely

• Eliminate the need for maintenance

• Only control the steering system

An example of feedback control in marine engineering is:

• A thermostat maintaining engine coolant temperature

• A pre-programmed engine start sequence

• A manual throttle adjustment

• An open-loop fuel injection system