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 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 will absorb equal amount of radiation from the surrounding in the beginning

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

There is no additional cost of pumping
Heat sensitive material can be handled
Equal heat transfer co-efficients exist in various effects
Most concentrated liquid is at highest temperature

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