Allied & ICAR Exam Bank • ALLIED_0699 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat and Mass Transfer in Food Processing

Subtopic: Heat and Mass Transfer in Food Processing

Question Statement:

In multiple-effect evaporators used in milk powder manufacturing, the steam economy increases approximately:

Options:

  • (A) Linearly with the number of effects ($N$), so an $N$-effect evaporator has steam economy $\sim 0.8 N$
  • (B) Inversely with $N$
  • (C) Exponentially as $N^3$
  • (D) Remains constant at 0.5

Answer Key:

A

Step-by-Step Solution & Explanation

Each effect reuses vapor boiled off from the previous effect as heating steam for the subsequent effect running at lower pressure, so steam economy roughly approaches $N$.
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