Allied & ICAR Exam Bank • ALLIED_1316 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Food Rheology and Texture

Subtopic: Capillary Viscometer

Question Statement:

In a capillary tube viscometer of tube radius $R = 0.001\text{ m}$ and length $L = 0.10\text{ m}$, the wall shear stress under a driving pressure drop $\Delta P = 2000\text{ Pa}$ is $\tau_w = \frac{\Delta P \cdot R}{2 L}$. The wall shear stress in Pascals is:

Answer Key:

10.0

Step-by-Step Solution & Explanation

$\tau_w = \frac{2000 \times 0.001}{2 \times 0.10} = \frac{2.0}{0.20} = 10.0\text{ Pa}$.
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