Question

Given below are two statements
Statement I: Vertical long tube evaporator is also called as Rising film evaporator 
Statement II: Falling film evaporator is also called as Forced circulation type evaporator 
In light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is correct but Statement II is incorrect
• D. Statement I is incorrect but Statement II is correct

Answer 1

The Correct Option is C

To solve this question, we need to evaluate the truth of two statements related to types of evaporators used in pharmaceutical engineering.

1. Statement I: Vertical long tube evaporator is also called a Rising film evaporator
   • A rising film evaporator is indeed a type of vertical long tube evaporator. In this type, the liquid feed enters from the bottom, and as it heats, it forms a thin film that rises along the walls of the tube due to the vapor produced during boiling. This configuration effectively makes it a "rising film" evaporator.
   • Therefore, Statement I is correct.
2. Statement II: Falling film evaporator is also called a Forced circulation type evaporator
   • A falling film evaporator and a forced circulation evaporator are not the same. A falling film evaporator involves liquid flowing down a tube as a film, driven by gravity. On the other hand, a forced circulation evaporator relies on a pump to circulate the liquid, enhancing the flow and heat transfer, especially in cases where the liquid is viscous or prone to fouling.
   • Therefore, Statement II is incorrect.

Conclusion: Based on the analysis, "Statement I is correct but Statement II is incorrect."