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Natural fibre products Quiz 20

Theme: Natural Fibre Products NFP Quiz 20 Natural fibre products Quiz 20

Natural fibre products Quiz 20

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Question 1 of 10

1. Question
1. What are the principal structural elements of paper?
- A) Fillers
- B) Fibres
- C) Pigments
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Question 2 of 10

2. Question
2. How does the anisotropic shrinkage of fibres during paper drying affect the fibre network?
- A) It increases the opacity of the paper
- B) It reduces the tensile strength of the paper
- C) It generates internal stresses in the fibre network
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Question 3 of 10

3. Question
3. What are the two main types of pulps used in papermaking, and how do they differ?
- A) Recycled pulp and virgin pulp; they differ in their environmental impact
- B) Mechanical pulp and chemical pulp; they differ in their effects on paper properties and the processes used to create them
- C) Softwood pulp and hardwood pulp; they differ in their fiber length
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Question 4 of 10

4. Question
4. What is the significance of fibre length in papermaking?
- A) Fibre length has no significant impact on paper properties
- B) Shorter fibres decrease the smoothness of the paper
- C) Longer fibres can form more bonds with other fibres, increasing the tensile strength of the wet web and dry paper
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Question 5 of 10

5. Question
5. How does the cell wall structure of a wood fibre influence its properties?
- A) The P layer is the thickest and dominates the mechanical properties of the fibre
- B) The S2 layer is the thickest and dominates the mechanical properties of the fibre
- C) The S1 layer is the thickest and dominates the mechanical properties of the fibre
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Question 6 of 10

6. Question
6. What is the role of fines in the papermaking process?
- A) Fines are removed during the papermaking process as they have no significant role
- B) Fines are used to increase the brightness of the paper
- C) Fines influence the structure and properties of the fibre network, affecting bonding and the mechanical properties of paper
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Question 7 of 10

7. Question
7. How does the beating process affect chemical pulp fibres?
- A) Beating loosens the fibre wall structure, increases swelling and conformability, and improves inter-fibre bonding and strength properties
- B) Beating reduces the fibre length and decreases the strength properties
- C) Beating has no effect on chemical pulp fibres
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Question 8 of 10

8. Question
8. What is the Campbell effect in the context of papermaking?
- A) It refers to the surface tension forces that pull fibres closer together during water removal, aiding in bond formation
- B) It is the effect of temperature on the drying rate of paper
- C) It describes the impact of chemical additives on paper brightness
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Question 9 of 10

9. Question
9. What are the main differences between mechanical and chemical pulps in terms of their properties?
- A) Mechanical pulps have higher lignin content, higher yield, and better opacity, while chemical pulps have higher tensile strength and better bonding ability
- B) Mechanical pulps are more expensive to produce than chemical pulps
- C) Chemical pulps are used exclusively for high-quality paper products
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Question 10 of 10

10. Question
10. How do drying conditions affect the mechanical properties of fibres in paper?
- A) Drying under tension increases tensile strength and elastic modulus, while drying under compression decreases them
- B) Drying conditions have no effect on the mechanical properties of fibres
- C) Drying under compression increases tensile strength and elastic modulus
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This page has been updated 07.01.2026

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