Question:
Which of the following cannot be prepared by extruders?
Which of the following cannot be prepared by extruders?
Show Hint
Classic corn flakes are easily distinguished from extruded snacks because they retain the irregular, flattened shape of the original corn grit from the rolling/toasting process.
Updated On: Jul 10, 2026
- Direct expanded corn snacks
- Pet food
- Corn flakes
- Pasta products
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Food extrusion is a high-temperature, short-time (HTST) process where starches and proteins are plasticized, cooked, and shaped under high pressure inside an extruder barrel.
Step 2: Detailed Explanation:
Let us examine how each product is manufactured:
1. Direct expanded corn snacks (e.g., cheese puffs): Made using single or twin-screw cooking extruders where moisture flashes off at the die, causing rapid expansion.
2. Pet food (kibbles): Typically produced using cooking extruders that gelatinize starches, denature proteins, and shape the feed.
3. Pasta products: Commonly manufactured using cold extrusion systems that shape semolina dough under low-shear conditions without cooking.
4. Corn flakes: Made using a traditional flaking process.
Whole corn grits are pressure-cooked with syrup, dried, flaked between heavy rollers, and then toasted in hot-air ovens to achieve their blistered, crispy texture.
Because they are made from flaked whole grits rather than an extruded starch paste, they cannot be prepared using standard food extruders.
Step 3: Final Answer:
Corn flakes are manufactured using rolling mill systems and cannot be prepared by food extruders.
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