Question:
The extruded product usually puffs and changes texture as it is extruded because of the reduction of forces and release of moisture and heat. The extent to which it does so is known as:
The extruded product usually puffs and changes texture as it is extruded because of the reduction of forces and release of moisture and heat. The extent to which it does so is known as:
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The expansion ratio is affected by the starch content, moisture level, and temperature of the melt. Higher starch and lower moisture usually result in higher expansion.
Updated On: Jul 4, 2026
- Residence time
- Expansion ratio
- Cooking time
- Cooking rate
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The Correct Option is B
Solution and Explanation
Concept:
Extrusion cooking involves forcing a material through a shaped die under high pressure and temperature.
• Flash evaporation: Occurs when the product exits the high-pressure die into the atmosphere.
• Puffing: The rapid expansion of steam creates a porous, airy structure.
Step 1: The physics of puffing.
Inside the extruder, water is kept liquid by extreme pressure. Upon exit, the pressure drops instantly, and the water turns to steam.
Step 2: Defining the measurement.
The degree of this "puffing" is a key quality parameter for snacks and cereals. It is measured as the ratio of the cross-sectional area of the product to the area of the die hole.
Step 3: Conclusion.
This specific measurement is called the Expansion Ratio. Final Answer: (B)
• Flash evaporation: Occurs when the product exits the high-pressure die into the atmosphere.
• Puffing: The rapid expansion of steam creates a porous, airy structure.
Step 1: The physics of puffing.
Inside the extruder, water is kept liquid by extreme pressure. Upon exit, the pressure drops instantly, and the water turns to steam.
Step 2: Defining the measurement.
The degree of this "puffing" is a key quality parameter for snacks and cereals. It is measured as the ratio of the cross-sectional area of the product to the area of the die hole.
Step 3: Conclusion.
This specific measurement is called the Expansion Ratio. Final Answer: (B)
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