Radiator cooling principle — UPSC Prelims PYQ 2010
What is the principle by which a cooling system (Radiator) in a motor car works?
- Conduction only
- Convection
- Radiation only
- Both conduction and radiation
Explanation
Option (b) is correct
- In a motor car radiator, heat from the engine is transferred to the coolant. The heated coolant rises and circulates, while cooler fluid descends, establishing convection currents. Heat is then dissipated to the surrounding air. While conduction occurs at the metal surfaces, the primary mechanism responsible for heat removal in the radiator system is convection.
Answer: (b) Convection
