Heat and Mass Transfer Unit of thermal conductivity in S.I. units is J/m °K sec Option (B) and (C) above J/m² sec W/m °K J/m °K sec Option (B) and (C) above J/m² sec W/m °K ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer A grey body is one whose absorptivity Varies with wavelength of the incident ray Is equal to its emissivity Does not vary with temperature and. wavelength of the incident ray Varies with temperature Varies with wavelength of the incident ray Is equal to its emissivity Does not vary with temperature and. wavelength of the incident ray Varies with temperature ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The heat is transferred by conduction, convection and radiation in Boiler furnaces None of these Condensation of steam in condenser Melting of ice Boiler furnaces None of these Condensation of steam in condenser Melting of ice ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of 0.042361111111111 0.084027777777778 0.043055555555556 0.16736111111111 0.042361111111111 0.084027777777778 0.043055555555556 0.16736111111111 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The value of Prandtl number for air is about 1.7 0.3 0.7 0.1 1.7 0.3 0.7 0.1 ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Fouling factor is used In case of Newtonian fluids In heat exchanger design as a safety factor When a liquid exchanges heat with a gas None of these In case of Newtonian fluids In heat exchanger design as a safety factor When a liquid exchanges heat with a gas None of these ANSWER DOWNLOAD EXAMIANS APP
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