Heat Transfer Absorptivity and refletivity of a perfect black body are respectively 1 and ? 0 and 0.5 0 and 1 1 and 0 1 and ? 0 and 0.5 0 and 1 1 and 0 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The ratio of momentum diffusivity to thermal diffusivity is the __________ number. Prandtl Nusselt Grashoff Stanton Prandtl Nusselt Grashoff Stanton ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires None of these Less heating surface More space Lower maintenance cost None of these Less heating surface More space Lower maintenance cost ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time t = 356 s t = 400 s t = 800 s t = 283 s t = 356 s t = 400 s t = 800 s t = 283 s ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a heat exchanger, one transfer unit means Both A and B The size of the exchanger in which heat transfer rate is 1 kcal/hr None of these A section of the exchanger in which change in temperature of one stream equals the average driving force in the section Both A and B The size of the exchanger in which heat transfer rate is 1 kcal/hr None of these A section of the exchanger in which change in temperature of one stream equals the average driving force in the section ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Reynold's analogy states that (where, St = Stanton number f = friction factor) St = f/4 St = 4f St = f/2 St = f1/2 St = f/4 St = 4f St = f/2 St = f1/2 ANSWER DOWNLOAD EXAMIANS APP
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