Heat and Mass Transfer Which of the following would lead to a reduction in thermal resistance? In radiation, increasing the temperature and reducing the emissivity. In convection, stirring of the fluid and cleaning the heating surface. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. All of these In radiation, increasing the temperature and reducing the emissivity. In convection, stirring of the fluid and cleaning the heating surface. In conduction, reduction in the thickness of the material and an increase in thermal conductivity. All of these ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity) RN = hl/k RN = V²/t.cp RN = μ cp/k RN = ρ V l /μ RN = hl/k RN = V²/t.cp RN = μ cp/k RN = ρ V l /μ ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Heat transfer takes place as per Zeroth law of thermodynamics Kirchoff's law Second law of the thermodynamics First law of thermodynamic Zeroth law of thermodynamics Kirchoff's law Second law of the thermodynamics First law of thermodynamic ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following has least value of conductivity? Glass Air Plastic Water Glass Air Plastic Water ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The energy distribution of an ideal reflector at higher temperatures is largely in the range of Wavelength has nothing to do with it Shorter wavelength Longer wavelength Remain same at all wavelengths Wavelength has nothing to do with it Shorter wavelength Longer wavelength Remain same at all wavelengths ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In case of liquids and gases, the heat transfer takes place according to None of these Convection Radiation Conduction None of these Convection Radiation Conduction ANSWER DOWNLOAD EXAMIANS APP
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