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Which one of the following is an example of open loop control? Air conditioner Motor speed controller Car cruise control system Ceiling fan

Question

Which one of the following is an example of open loop control?

  • Air conditioner
  • Motor speed controller
  • Car cruise control system
  • Ceiling fan
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Solution

An example of an open loop control system from the options provided is a Ceiling fan.

Here's why:

An open loop control system is one where the control action is independent of the output. In other words, it doesn't have any feedback system to control its output.

A ceiling fan is a good example of this. When you switch on a ceiling fan, it starts to rotate at a speed that's determined by the control knob position. The fan doesn't have any mechanism to check if the room is sufficiently cool and then adjust its speed accordingly. It will keep running at the same speed until you manually change the control knob position. This is characteristic of an open loop control system.

On the other hand, an air conditioner, motor speed controller, and car cruise control system are examples of closed loop control systems because they adjust their output based on feedback. For example, an air conditioner adjusts its cooling based on the room temperature (feedback), a motor speed controller adjusts the motor speed based on the actual speed (feedback), and a car cruise control system adjusts the car speed based on the actual car speed (feedback).

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