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**The heat is transferred by conduction, convection and radiation in****The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer…****According to Wien's law, the wavelength corresponding to maximum energy is proportion to****The unit of overall coefficient of heat transfer is****Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without…****In case of liquids and gases, the heat transfer takes place according to****Which of the following has least value of conductivity?****When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the…****The process of heat transfer from one particle of the body to another is called conduction, when the…****Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take…****The energy distribution of an ideal reflector at higher temperatures is largely in the range of****The value of the wavelength for maximum emissive power is given by****In free convection heat transfer transition from laminar to turbulent flow is governed by the critical…****Which of the following property of air does not increase with rise in temperature?****The amount of heat flow through a body by conduction is****The heat transfer takes place according to****Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated…****Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)****According of Kirchhoff's law****The critical thickness of insulation for a sphere is****An ordinary passenger aircraft requires a cooling system of capacity.****The product of Reynolds number and Prandtl number is known as****According to Newton's law of cooling, the heat transfer from a hot body to a cold body is****The value of the wave length for maximum emissive power is given by****An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK).…****A grey body is one whose absorptivity****Reynolds number is the ratio of****Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in****Metals are good conductors of heat because****Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly…**