Heat Transfer Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the Constant temperature equal to that of the base Average temperature of the fin Surrounding temperature Temperature of the fin end Constant temperature equal to that of the base Average temperature of the fin Surrounding temperature Temperature of the fin end ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer If heat transfer rate varies with the time, it is termed as Forced convection Monochromatic radiation None of these Steady state conduction Forced convection Monochromatic radiation None of these Steady state conduction ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In thermal radiation for a black body (where, ε is emissivity and α is absorptivity) α = 1; ε = 1 α ≠ 1, ε = 1 α ≠ 1, ε ≠ 1 α = 1; ε ≠ 1 α = 1; ε = 1 α ≠ 1, ε = 1 α ≠ 1, ε ≠ 1 α = 1; ε ≠ 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Thermal diffusivity of a material All of these Is the ratio of thermal conductivity to thermal capacity Has the unit m² /sec Is defined as K/ρ . Cp All of these Is the ratio of thermal conductivity to thermal capacity Has the unit m² /sec Is defined as K/ρ . Cp ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following is concerned with both heat and mass transfer ? Kutateladze number Nusselt number Lewis relationship Froude number Kutateladze number Nusselt number Lewis relationship Froude number ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then hf > hd hf < hd hf could be greater or smaller than hd hf = hd hf > hd hf < hd hf could be greater or smaller than hd hf = hd ANSWER DOWNLOAD EXAMIANS APP
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