Discussion
The following is an example for closed loop system :
Answer: D
The closed loop example is the refrigerator.
A refrigerator's thermostat senses the temperature inside the cabinet and compares it with the setting. When it is too warm, the compressor is switched on; when the set temperature is reached, it is switched off. The output (temperature) is measured and fed back to control the input, which is the defining feature of a closed loop system.
An ordinary room fan, a simple air cooler and a basic laboratory soldering iron run at whatever setting the user chooses without measuring their effect, so they are open loop systems (unless fitted with a thermostat).
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