Heat and Mass Transfer Emissivity of a white polished body in comparison to a black body is Higher Same Depends upon the shape of body Lower Higher Same Depends upon the shape of body Lower ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as None of these Thermal conductivity Thermal coefficient Thermal resistance None of these Thermal conductivity Thermal coefficient Thermal resistance ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Unit of thermal conductivity in S.I. units is J/m °K sec W/m °K J/m² sec Option (B) and (C) above J/m °K sec W/m °K J/m² sec Option (B) and (C) above 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 Four One Two Three Four One Two Three ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a Red hot body Black body Grey body Brilliant white polished body Red hot body Black body Grey body Brilliant white polished body ANSWER DOWNLOAD EXAMIANS APP
Heat and Mass Transfer Which of the following has least value of conductivity? Plastic Glass Water Air Plastic Glass Water Air ANSWER DOWNLOAD EXAMIANS APP
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