Heat and Mass Transfer The concept of overall coefficient of heat transfer is used in case of heat transfer by Conduction Conduction and convection Radiation Convection Conduction Conduction and convection Radiation Convection ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Thermal conductivity of air with rise in temperature Decreases Remain constant May increase or decrease depending on temperature Increases Decreases Remain constant May increase or decrease depending on temperature Increases ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer, The better insulation must be put inside The better insulation must be put outside One should take into account the steam temperature before deciding as to which insulation is put where One could place either insulation on either side The better insulation must be put inside The better insulation must be put outside One should take into account the steam temperature before deciding as to which insulation is put where One could place either insulation on either side ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature. Both (A) and (B) None of these Minimum energy Maximum energy Both (A) and (B) None of these Minimum energy Maximum energy ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following has least value of conductivity? Glass Air Plastic Water Glass Air Plastic Water ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity) P = 0, x= 1, and a = 0 P = 0, x = 0 and a = 1 X = 0, a + p = 1 P=1, x = 0, and a = 0 P = 0, x= 1, and a = 0 P = 0, x = 0 and a = 1 X = 0, a + p = 1 P=1, x = 0, and a = 0 ANSWER DOWNLOAD EXAMIANS APP
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