Heat and Mass Transfer According to Wien's law, the wavelength corresponding to maximum energy is proportion to T Absolute temperature (T) I² F T Absolute temperature (T) I² F ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The energy distribution of an ideal reflector at higher temperatures is largely in the range of Remain same at all wavelengths Shorter wavelength Wavelength has nothing to do with it Longer wavelength Remain same at all wavelengths Shorter wavelength Wavelength has nothing to do with it Longer wavelength ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The value of Prandtl number for air is about 0.1 0.3 1.7 0.7 0.1 0.3 1.7 0.7 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be Three One Four Two Three One Four Two ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be 25 mm 800 mm 40 mm 160 mm 25 mm 800 mm 40 mm 160 mm ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called First law of thermodynamics Newton's law of cooling Stefan's law Newton's law of heating First law of thermodynamics Newton's law of cooling Stefan's law Newton's law of heating ANSWER DOWNLOAD EXAMIANS APP
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