Allied & ICAR Exam Bank • ALLIED_1329 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Dairy Unit Operations

Subtopic: CIP Cleaning in Dairies

Question Statement:

In dairy plant Clean-In-Place (CIP) regimes, the standard two-stage chemical washing sequence consists of:

Options:

  • (A) Hot alkaline caustic wash (1.0% to 1.5% NaOH at 70 to 75 deg C) to remove fats and proteins, followed by acid wash (0.5% to 1.0% HNO3) to dissolve mineral milkstone
  • (B) Cold pure water only
  • (C) Concentrated hydrochloric acid followed by acetone
  • (D) Steam wash only

Answer Key:

A

Step-by-Step Solution & Explanation

Caustic soda (alkali) saponifies milk fats and peptizes proteins; subsequent dilute nitric or phosphoric acid dissolves stubborn calcium phosphate/milkstone scale deposits.
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