Question 111Steam Plants - QMED

The correct answer is B) Radiation. Radiation is the only mode of heat transfer that does not require physical contact between a warmer and a cooler substance. Heat is transferred through the emission and absorption of electromagnetic waves, without the need for a physical medium. In contrast, conduction requires direct contact between the substances, and lamination is not a mode of heat transfer. All the other options (A, C, and D) are incorrect because they either do not accurately describe a mode of heat transfer or fail to capture the unique characteristic of radiation that distinguishes it from the other heat transfer mechanisms.