Question Bank • QB_APE_036 NAT • 1 Mark

Section 6: Agricultural Process Engineering

Processing of Agriculture Produce

Subtopic: Value addition of agriculture produce

Question Statement:

A single-screw food extruder is fitted with a circular die orifice of diameter $d_{die} = 3.0\text{ mm}$. The cylindrical puffed cereal extrudate emerging from the die expands to a diameter $d_{ext} = 7.5\text{ mm}$. The sectional expansion ratio ($ER = (d_{ext} / d_{die})^2$) of the extrudate is ________ (round off to 2 decimal places).

Answer Key:

6.25

Step-by-Step Solution & Explanation

The sectional expansion ratio $ER$ is defined by the square of the ratio of extrudate diameter to die orifice diameter: $ER = \left( \frac{d_{ext}}{d_{die}} \right)^2 = \left( \frac{7.5\text{ mm}}{3.0\text{ mm}} \right)^2 = (2.5)^2 = 6.25$
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