Black body

Grey body

Opaque body

White body

**Which of the following has least value of conductivity?****The heat transfer by conduction through a thick sphere is given by****The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive…****When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening…****Which of the following statement is correct?****In case of liquids and gases, the heat transfer takes place according to****The value of the wave length for maximum emissive power is given by****Film coefficient is defined as Inside diameter of tube****Which of the following property of air does not increase with rise in temperature?****The most commonly used method for the design of duct size is the****The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive…****Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)****According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure…****The process of heat transfer from one particle of the fluid to another by the actual movement of the…****According to Prevost theory of heat exchange****An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK).…****The heat transfer by conduction through a thick cylinder (Q) is given by (where T₁ = Higher temperature,…****Kirchhoff's law states that****In a shell and tube heat exchanger, baffles are provided on the shell side to****Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take…****The time constant of a thermocouple is****The amount of radiation mainly depends upon the****The rate of energy transferred by convection to that by conduction is called****Conduction is a process of heat transfer****In heat transfer, conductance equals conductivity (kcal/hr/sq.m/ °C/cm) divided by****A grey body is one whose absorptivity****Fourier's law of heat conduction gives the heat flow for****A non-dimensional number generally associated with natural convection heat transfer is****Upto the critical radius of insulation,****Which of the following is a case of steady state heat transfer?**