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  1. Traffic light control system
  2. Voltage stabilize
  3. Bread toaster
  4. TV remote control
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1 Answers

Option 2 : Voltage stabilize

Concept:

Open-loop system:

  • An open-loop system is defined as a system in which the output signal is not fed back for comparison with the input signal.
  • Thus the output is not affected by the changes in the input.

Closed-loop system:

  • A closed-loop system is defined as a system in which the output signal is fed back for comparison with the input signal.
  • Thus the output is affected by the changes in the input.

Explanation:

  • In a traffic light system, the system will not measure the density of the traffic before giving the signals. Since the time slot does not change according to traffic density, the system is an open-loop system.
  • A servo voltage stabilizer is a closed-loop control mechanism that serves to maintain balanced 3 or single-phase voltage output despite fluctuations at the input owing to unbalanced conditions.
  • In an automatic toaster, bread is one of the inputs while the timer which has to be operated is another input. Depending on the time setting, bread is simply heated in the system. The toast quality is judged by the user and has no effect on the input, therefore, the output has no effect on the input. Hence the automatic toaster is an open-loop system.
  • The operation of the TV remote does not get affected by the usage of TV, hence it is an open-loop system.
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