Convection

Radiation

Conduction

Both convection and conduction

**The product of Reynolds number and Prandtl number is known as****Cork is a good insulator because it has****The insulation ability of an insulator with the presence of moisture would****A steam pipe is to be insulated by two insulating materials put over each other. For best results****A composite slab has two layers of different materials with thermal conductivities k₁ and k₂.…****According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is…****In case of liquids and gases, the heat transfer takes place according to****The process of heat transfer from one particle of the body to another by the actual motion of the heated…****The value of the wave length for maximum emissive power is given by****When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous…****Heat flows from one body to other when they have****When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening…****Conduction is a process of heat transfer****According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to****Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of…****Thermal diffusivity of a substance is****When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the…****In counter flow heat exchangers****The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as****According to Wien's law, the wavelength corresponding to maximum energy is proportion to****Thermal conductivity of water in general with rise in temperature****The amount of heat flow through a body by conduction is****Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in****Which of the following has least value of conductivity?****In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is…****The unit of Stefan Boltzmann constant is****According to Prevost theory of heat exchange****The concept of overall coefficient of heat transfer is used in heat transfer problems of****A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two…****Film coefficient is defined as the ratio of**