Heat and Mass Transfer Upto the critical radius of insulation, Heat flux will decrease Added insulation will decrease heat loss Added insulation will increase heat loss Convective heat loss will be less than conductive heat loss Heat flux will decrease Added insulation will decrease heat loss Added insulation will increase heat loss Convective heat loss will be less than conductive heat loss ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as Thermal resistance None of these Thermal coefficient Thermal conductivity Thermal resistance None of these Thermal coefficient Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat transfer by conduction through a thick sphere is given by Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1) Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1) ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of Hot medium outlet and cold water inlet Cold water inlet and outlet Hot medium outlet and cold water outlet Hot medium inlet and outlet Hot medium outlet and cold water inlet Cold water inlet and outlet Hot medium outlet and cold water outlet Hot medium inlet and outlet ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour) Pb = pa × pv Pb = pa + pv Pb = pa/pv Pb = pa - pv Pb = pa × pv Pb = pa + pv Pb = pa/pv Pb = pa - pv ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thermal diffusivities for gases are generally More than those for liquids More than those for solids Less than those for liquids Dependent on the viscosity More than those for liquids More than those for solids Less than those for liquids Dependent on the viscosity ANSWER DOWNLOAD EXAMIANS APP
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