Heat Transfer Which of the following is generally considered as opaque surface towards radiations? Both solids & liquids Liquids Gases Solids Both solids & liquids Liquids Gases Solids ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes. 10 Either B or C, depends on the mass of the body >10 10 Either B or C, depends on the mass of the body >10 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In natural convection heat transfer, the correlating parameter is the Eckert number Bond number Graetz number Grashoff number Eckert number Bond number Graetz number Grashoff number ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when KA>2 kB CPA > CPB CPA < CPB KA < 0.5kB KA>2 kB CPA > CPB CPA < CPB KA < 0.5kB ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides Lower capacity Both A & B Lower economy Higher economy Lower capacity Both A & B Lower economy Higher economy ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a body is equal to its emissivity for circular bodies at a particular temperature under thermal equilibrium none of the listed here for circular bodies at a particular temperature under thermal equilibrium none of the listed here ANSWER DOWNLOAD EXAMIANS APP
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