Heat and Mass Transfer The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as Wien's law Kirchhoff's law Planck's law Stefan's law Wien's law Kirchhoff's law Planck's law Stefan's law ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Kirchhoff's law states that The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature The wave length corresponding to the maximum energy is proportional to the absolute temperature None of these The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature The wave length corresponding to the maximum energy is proportional to the absolute temperature None of these The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The insulation ability of an insulator with the presence of moisture would Remain unaffected Decrease Increase May increase/decrease depending on temperature and thickness of insulation Remain unaffected Decrease Increase May increase/decrease depending on temperature and thickness of insulation ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat transfer takes place according to Kirchhoff's law Second law of thermodynamics First law of thermodynamics Zeroth law of thermodynamics Kirchhoff's law Second law of thermodynamics First law of thermodynamics Zeroth law of thermodynamics ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Cork is a good insulator because it has Porous body Atoms colliding frequency Free electrons Low density Porous body Atoms colliding frequency Free electrons Low density ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is 40°C 60°C 66.7°C 20°C 40°C 60°C 66.7°C 20°C ANSWER DOWNLOAD EXAMIANS APP
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