Heat and Mass Transfer Thermal diffusivity of a substance is Directly proportional to the thermal conductivity Inversely proportional to density of substance Inversely proportional to specific heat All of these Directly proportional to the thermal conductivity Inversely proportional to density of substance Inversely proportional to specific heat All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Newton's law of cooling, the heat transfer from a hot body to a cold body is Directly proportional to the difference of temperatures between the two bodies Both (A) and (B) Either (A) or (B) Directly proportional to the surface area Directly proportional to the difference of temperatures between the two bodies Both (A) and (B) Either (A) or (B) Directly proportional to the surface area ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thermal diffusivities for gases are generally More than those for solids Dependent on the viscosity Less than those for liquids More than those for liquids More than those for solids Dependent on the viscosity Less than those for liquids More than those for liquids ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The emissivity for a black body is 1 0.5 0.75 1 0.5 0.75 ANSWER DOWNLOAD EXAMIANS APP
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 total emissivity power is .defined as the total amount of radiation emitted by a black body per unit Time Area Temperature Thickness Time Area Temperature Thickness ANSWER DOWNLOAD EXAMIANS APP
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