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A thermostat is a device for
1. Switching off electric appliances
2. Measuring temperature
3. Regulating temperature 
4. Producing heat

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Correct Answer - Option 3 : Regulating temperature 

The correct answer is Regulating temperature.

  • The thermostat is a device that helps to keep the temperature of a system fixed around a certain temperature
  • The thermostat performs this function by turning the heater and cooling devices on or off as needed or by regulating the flow of heat-transfer fluid as necessary to maintain the desired temperature.
  • The thermostat is used primarily to heat the engine quickly and then to keep the engine at a constant temperature.
  • At low temperatures, it completely blocks the radiator’s exhaust door so that all coolant is re-circulated in the engine.

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