Question Bank • QB_DFE_UOP_009 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Blanching

Question Statement:

Arrange the following pressure-driven membrane filtration processes in order of INCREASING membrane pore size (or nominal molecular weight cut-off, MWCO):

Options:

  • (A) Reverse Osmosis (RO) < Nanofiltration (NF) < Ultrafiltration (UF) < Microfiltration (MF)
  • (B) Microfiltration (MF) < Ultrafiltration (UF) < Nanofiltration (NF) < Reverse Osmosis (RO)
  • (C) Ultrafiltration (UF) < Microfiltration (MF) < Reverse Osmosis (RO) < Nanofiltration (NF)
  • (D) Nanofiltration (NF) < Reverse Osmosis (RO) < Microfiltration (MF) < Ultrafiltration (UF)

Answer Key:

A

Step-by-Step Solution & Explanation

The hierarchy of pore size and MWCO increases from dense non-porous RO (
lt; 100\text{ Da}, < 0.1\text{ nm}$) to NF ($200-1000\text{ Da}, \approx 1\text{ nm}$), to UF ($1-300\text{ kDa}, 2-100\text{ nm}$), to MF ($0.1-10\,\mu\text{m}$).
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