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 = 400 s
t = 283 s
t = 800 s
t = 356 s

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Heat Transfer
Baffle spacing

Should be less than one fifth the diameter of the shell
Should be less than the inside diameter of the shell
None of these
Is not the same as baffle pitch

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Heat Transfer
Vacuum is generally maintained in the vapour space of an evaporator mainly to

Facilitate forward feeding in multiple effect evaporation
Achieve very high concentration of the final product
Concentrate heat sensitive materials
Get economical temperature difference by using moderate pressure steam

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