Heat and Mass Transfer Planck’s law holds good for black bodies polished bodies all coloured bodies All of these black bodies polished bodies all coloured bodies All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as Thermal coefficient None of these Thermal resistance Thermal conductivity Thermal coefficient None of these Thermal resistance Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following would lead to a reduction in thermal resistance? In convection, stirring of the fluid and cleaning the heating surface. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. In radiation, increasing the temperature and reducing the emissivity. All of these In convection, stirring of the fluid and cleaning the heating surface. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. In radiation, increasing the temperature and reducing the emissivity. All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According of Kirchhoff's law Radiant heat is proportional to fourth power of absolute temperature Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body Emissive power depends on temperature Emissive power and absorptivity are constant for all bodies Radiant heat is proportional to fourth power of absolute temperature Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body Emissive power depends on temperature Emissive power and absorptivity are constant for all bodies ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fourier's law of heat conduction is valid for One dimensional cases only Regular surfaces having non-uniform temperature gradients Three dimensional cases only Two dimensional cases only One dimensional cases only Regular surfaces having non-uniform temperature gradients Three dimensional cases only Two dimensional cases only ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet Hot medium inlet and outlet Cold water inlet and outlet Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet Hot medium inlet and outlet Cold water inlet and outlet ANSWER DOWNLOAD EXAMIANS APP
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