Heat Transfer A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, Both the spheres will emit equal amount of radiation per unit time in the beginning Both will absorb equal amount of radiation from the surrounding in the beginning Both B & C The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant Both the spheres will emit equal amount of radiation per unit time in the beginning Both will absorb equal amount of radiation from the surrounding in the beginning Both B & C The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The ratio of momentum diffusivity to thermal diffusivity is the __________ number. Stanton Grashoff Prandtl Nusselt Stanton Grashoff Prandtl Nusselt ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer According to Reynolds analogy, Stanton number is equal to f/2 2f f f/4 f/2 2f f f/4 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fouling factor Does not provide a safety factor for design Accounts for additional resistances to heat flow Is a dimensionless quantity None of these Does not provide a safety factor for design Accounts for additional resistances to heat flow Is a dimensionless quantity None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Vacuum is generally maintained in the vapour space of an evaporator mainly to Facilitate forward feeding in multiple effect evaporation Concentrate heat sensitive materials Get economical temperature difference by using moderate pressure steam Achieve very high concentration of the final product Facilitate forward feeding in multiple effect evaporation Concentrate heat sensitive materials Get economical temperature difference by using moderate pressure steam Achieve very high concentration of the final product ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Shell side pressure drop in a shell and tube heat exchanger does not depend upon the None of these Viscosity, density & mass velocity of shell side fluid Tube diameter & pitch Baffle spacing & shell diameter None of these Viscosity, density & mass velocity of shell side fluid Tube diameter & pitch Baffle spacing & shell diameter ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS