Question

In multiple-effect evaporation, the major advantage is:

• A. Larger equipment size
• B. Faster drying
• C. Lower final solids
• D. Reduced energy consumption

Hint:

Multiple-effect = reuse steam → saves energy.

Answer 1

The Correct Option is D

Concept: Multiple-effect evaporation is a process where vapor generated in one effect is used as the heating medium for the next effect. This leads to efficient utilization of energy.

Step 1: Understanding single vs multiple effect.
• Single effect: Steam used once
• Multiple effect: Steam reused multiple times

Step 2: Mechanism of energy saving.
In multiple-effect evaporation:
• Vapor from first effect heats second effect
• This reduces fresh steam requirement

Step 3: Evaluating options.
• Larger equipment size — Disadvantage
• Faster drying — Not main advantage
• Lower final solids — Incorrect
• Reduced energy consumption — Correct

Step 4: Final reasoning.
Energy efficiency is the primary advantage. Final Conclusion:
Multiple-effect evaporation reduces energy consumption. Hence, option (4) is correct.