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Heat Transfer

Q1: Pick out the wrong statement.

A The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system.

B Entering velocity of the liquid in the tubes of natural circulation evaporators is in the range of 0.3 to 0.9 metre/second.

C Duhring's plot is used for calculating the concentration of solution.

D In a multiple effect evaporation system, the number of effects is limited by the total boiling point rise.

ANS:C - Duhring's plot is used for calculating the concentration of solution.

The wrong statement is: "The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system." In a multiple effect evaporator system, the hydrostatic head decreases with an increase in vacuum. This is because as the pressure decreases (due to increased vacuum), the weight of the liquid column above the boiling point decreases, leading to a decrease in the hydrostatic head. Therefore, the correct statement should be that the value of hydrostatic head decreases with an increase in vacuum in the effect in a multiple effect evaporator system.

 



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