Heat Transfer The film thickness for laminar film condensation on vertical surface __________ from top to bottom. Remains constant Cummulatively decreases Cummulatively increases And the surface conductance increase Remains constant Cummulatively decreases Cummulatively increases And the surface conductance increase ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fourier's law applies to the heat transfer by conduction radiation convection None of the listed here conduction radiation convection None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Thermal diffusivity of a material Is the ratio of thermal conductivity to thermal capacity All of these Has the unit m² /sec Is defined as K/ρ . Cp Is the ratio of thermal conductivity to thermal capacity All of these Has the unit m² /sec Is defined as K/ρ . Cp ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. 5 minutes 40 minutes 10 minutes 20 minutes 5 minutes 40 minutes 10 minutes 20 minutes ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will Increase by 216 Increase by 1.8 times Remain unchanged Decrease by 22 Increase by 216 Increase by 1.8 times Remain unchanged Decrease by 22 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film ) (ΔT)2 ΔT (ΔT)1/4 None of the listed here (ΔT)2 ΔT (ΔT)1/4 None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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