Allied & ICAR Exam Bank • ALLIED_0762 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Food Rheology

Subtopic: Food Rheology

Question Statement:

The Ostwald-de Waele power-law model for non-Newtonian fluid rheology is $\tau = K \dot{\gamma}^n$. A fluid is classified as 'pseudoplastic' (shear-thinning) when:

Options:

  • (A) Flow behavior index $n < 1$
  • (B) Flow behavior index $n > 1$
  • (C) Flow behavior index $n = 1$
  • (D) Consistency coefficient $K = 0$

Answer Key:

A

Step-by-Step Solution & Explanation

When $n < 1$, apparent viscosity $\eta_{app} = K \dot{\gamma}^{n-1}$ decreases with increasing shear rate, exhibiting shear-thinning (e.g., yogurt, fruit puree).
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