Closed-Loop vs Open-Loop Systems

This lecture covers the differences between open and closed loop systems in control systems. It begins with a review of open loop systems and their limitations, such as inability to handle disturbances. The lecture then introduces closed loop systems, which use feedback to maintain desired outputs and improve accuracy. Examples like air conditioners and geezers illustrate closed loop systems. A comparison highlights the reliability and complexity differences between the two systems. The lecture concludes with a preview of upcoming topics, including Laplace transforms.

What is a major disadvantage of open-loop systems?

• They cannot handle disturbances.

• They are too complex to design.

• They are too expensive.

• They require constant human intervention.

In an open-loop system, what does the controller section do?

• It measures the output.

• It compensates for disturbances.

• It processes the input.

• It controls the amount of input for the desired output.

How does a closed-loop system maintain the desired output?

• By using a feedback signal.

• By simplifying the circuitry.

• By increasing the input continuously.

• By ignoring disturbances.

What role does the error detection unit play in a closed-loop system?

• It processes the input.

• It measures the output.

• It determines the error with respect to the desired output.

• It controls the amount of input.

Which of the following is an example of a closed-loop system?

• A manual water pump.

• A simple light switch.

• An air conditioner.

• An immersion water heater.

How does a geyser maintain the desired water temperature?

• By ignoring the water temperature.

• By turning off and on based on the water temperature.

• By using a manual switch.

• By continuously heating the water.

What is a key distinguishing factor between open-loop and closed-loop systems?

• The type of input used.

• The cost of the system.

• The presence of feedback.

• The complexity of the design.

Why are closed-loop systems considered more reliable than open-loop systems?

• They can handle disturbances.

• They require no feedback.

• They have simpler designs.

• They are less expensive.

What is a disadvantage of closed-loop systems compared to open-loop systems?

• They cannot handle disturbances.

• They are more complex and expensive.

• They are less accurate.

• They require constant human intervention.

What will be discussed in the next lecture following this one?

• Review of Laplace transform.

• Transfer function of a control system.

• Comparison of different control systems.

• Types of feedback.