Heat and Mass Transfer According of Kirchhoff's law 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 and absorptivity are constant for all bodies Emissive power depends on temperature 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 and absorptivity are constant for all bodies Emissive power depends on temperature Radiant heat is proportional to fourth power of absolute temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is (h₁.h₂.h₃)1/3 h₁ + h₂ + h₃ None of these 1/h₁ + 1/h₂ + 1/h₃ (h₁.h₂.h₃)1/3 h₁ + h₂ + h₃ None of these 1/h₁ + 1/h₂ + 1/h₃ ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat of sun reaches to us according to None of these Convection Radiation Conduction None of these Convection Radiation Conduction ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of 0.042361111111111 0.043055555555556 0.16736111111111 0.084027777777778 0.042361111111111 0.043055555555556 0.16736111111111 0.084027777777778 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The critical thickness of insulation for a sphere is 2k/h₀ h₀/k k/h₀ h₀/2k 2k/h₀ h₀/k k/h₀ h₀/2k ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The transfer of heat by molecular collision is smallest in Liquids None of these Gases Solids Liquids None of these Gases Solids ANSWER DOWNLOAD EXAMIANS APP
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