Heat and Mass Transfer Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity) h = k/ ρS h = kρ/S h = ρS/k h = S/ρk h = k/ ρS h = kρ/S h = ρS/k h = S/ρk 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 Thermal coefficient None of these Thermal conductivity Thermal resistance Thermal coefficient None of these Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thermal diffusivities for solids are generally Less than those for liquids More or less same as for liquids and gases Less than those for gases More than those for liquids and gases Less than those for liquids More or less same as for liquids and gases Less than those for gases More than those for liquids and gases ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is 60°C 20°C 66.7°C 40°C 60°C 20°C 66.7°C 40°C ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in Boiler Electric heater Refrigerator condenser coils Steam condenser Boiler Electric heater Refrigerator condenser coils Steam condenser ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The critical radius is the insulation radius at which the resistance to heat flow is Maximum Zero None of these Minimum Maximum Zero None of these Minimum ANSWER DOWNLOAD EXAMIANS APP
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