Question

In a triple-effect backward feed evaporator, the pressure of vapor space in each of the effects is related by —————.
(Hint: Use steam entry as the first effect) 

• A. \( P_1 = P_2 = P_3 \)
• B. \( P_1>P_2>P_3 \)
• C. \( P_1<P_2<P_3 \)
• D. Cannot be said

Hint:

Backward feed evaporators are ideal for solutions sensitive to high temperatures.

Answer 1

The Correct Option is B

- In a backward feed evaporator, the steam is fed to the first effect, which operates at the highest pressure. 
- The subsequent effects operate at progressively lower pressures, allowing for efficient vapor utilization. 
Conclusion: 
The correct answer is option (B).