Question

Extrusion cooking is accomplished in four different stages (I, II, III, IV). Identify the correct order from the given options.

• A. I – Feeding, II – Cooking, III – Kneading, IV – Expansion
• B. I – Kneading, II – Feeding, III – Cooking, IV – Expansion
• C. I – Feeding, II – Kneading, III – Cooking, IV – Expansion
• D. I – Cooking, II – Kneading, III – Feeding, IV – Expansion

Hint:

Extrusion cooking always follows the flow: \textbf{Feed → Mix/Knead → Heat Cook → Expand}.

Answer 1

The Correct Option is C

Step 1: Understand extrusion stages.
- Feeding (I): Raw materials are introduced into the extruder.
- Kneading (II): Materials are mixed and compacted under pressure.
- Cooking (III): Heat and shear cause starch gelatinization and protein denaturation.
- Expansion (IV): On exiting, sudden pressure drop causes puffing/expansion.
Step 2: Analyze the options.
Only option (C) reflects the correct chronological process. Final Answer: \[ \boxed{\text{(C) I – Feeding, II – Kneading, III – Cooking, IV – Expansion}} \]