Heat Transfer
Reason for operating an evaporator in multiple effect is to secure

Both A and B
Increased capacity
Decreased steam consumption
Increased steam economy

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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
Equal heat transfer co-efficients exist in various effects
Most concentrated liquid is at highest temperature
Heat sensitive material can be handled

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

All of these
Presence of a non-condensible gas decreases the condensing film co-efficient
Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature
Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

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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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