Water circulation in a radiator takes place from ______

  1. Lower tank to upper tank
  2. Upper to lower tank
  3. Engine to upper tank
  4. Engine to water pump

Answer (Detailed Solution Below)

Option 2 : Upper to lower tank
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Radiator: The purpose of a radiator in the cooling system is to cool hot water coming out of the engine. It has a large cooling surface area to allow enough air to pass through it. Water circulated through it is cooled by the passing air.

The radiator consists of an upper tank, a lower tank and in between the upper and lower tank radiator cores are provided. The upper tank is connected to the water outlet of the engine through a rubber hose. The lower tank is connected to the water pump through rubber hoses. Thus water circulation takes place from the upper tank to lower tank.

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