What is the function of a thermostat in automobile cooling system?

What is the function of a thermostat in automobile cooling system?

Option:

a. to increase the temperature of the engine
b. to extract excess heat from the engine
c. to maintain engine at stable temperature
d. none of the above

Correct Answer : c. to maintain engine at stable temperature

Explanation:

The automobile engine has to be designed to operate at a stable temperature. Sometimes like in the morning or in winter season, the automobile engine operates differently. Engine has to be warmed up quickly to attain maximum efficiency. Once the engine is reached at a desired operating temperature, it is designed to be maintained at stable temperature. This purpose is fulfilled by the thermostat.

The thermostat is a valve like arrangement which opens and closes according to temperature. It is the function of temperature. When the engine is required to be warmed like in morning, the thermostat disconnects the engine from the radiator until it reaches to the sufficient operating temperature. Then afterwards the thermostat adjusts flow of coolant to the radiator.