Heat Transfer MCQs

In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid

Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.

In a 1-1 cocurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is

When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

Resistance to heat flow by conduction is proportional to (where, t & $$\rho $$ are thickness & density of the material respectively and A = area normal to the direction of heat flow.)

Increasing the liquor level in the evaporator results in the

Pick out the wrong statement.