Heat and Mass Transfer The concept of overall coefficient of heat transfer is used in heat transfer problems of Conduction and convection Convection Conduction Radiation Conduction and convection Convection Conduction Radiation ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The thermal diffusivities for solids are generally Less than those for liquids More than those for liquids and gases Less than those for gases More or less same as for liquids and gases Less than those for liquids More than those for liquids and gases Less than those for gases More or less same as for liquids and gases ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A grey body is one whose absorptivity Varies with wavelength of the incident ray Does not vary with temperature and. wavelength of the incident ray Varies with temperature Is equal to its emissivity Varies with wavelength of the incident ray Does not vary with temperature and. wavelength of the incident ray Varies with temperature Is equal to its emissivity 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 Two Three One Four Two Three One Four ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of Cold water inlet and outlet Hot medium inlet and outlet Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet Cold water inlet and outlet Hot medium inlet and outlet Hot medium outlet and cold water outlet Hot medium outlet and cold water inlet 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 160 mm 25 mm 800 mm 40 mm 160 mm 25 mm 800 mm 40 mm ANSWER DOWNLOAD EXAMIANS APP
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