Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Is easy to operate and maintain
Occupies smaller space
All of these
Is more economical

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP