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Natural fibre products Quiz 34

Theme: Natural Fibre Products NFP Quiz 34 Natural fibre products Quiz 34

Natural fibre products Quiz 34

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Question 1 of 10

1. Question
1. What does rheology study in the context of paper?
- A) The optical properties of paper
- B) The colour of paper
- C) The flow and deformation behavior of paper
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Question 2 of 10

2. Question
2. What is creep in paper mechanics?
- A) The reversible elastic strain
- B) The immediate recovery after stress
- C) The time-dependent inelastic strain under constant stress
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Question 3 of 10

3. Question
3. Which component in the fibre wall mainly controls the viscoelastic properties of paper?
- A) Filler particles
- B) Cellulose only
- C) Lignin and hemicelluloses
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Question 4 of 10

4. Question
4. What is the effect of increasing moisture content on the elastic modulus of paper?
- A) It increases the modulus
- B) It decreases the modulus
- C) No effect
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Question 5 of 10

5. Question
5. What is the main difference between stress relaxation and creep?
- A) Creep keeps stress constant, relaxation keeps strain constant
- B) Creep is reversible, relaxation is not
- C) Creep only occurs in dry paper
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Question 6 of 10

6. Question
6. What is hygroexpansion?
- A) Expansion due to increased temperature
- B) Expansion due to increased moisture content
- C) Expansion due to mechanical load
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Question 7 of 10

7. Question
7. In which direction is hygroexpansion typically largest in machine-made paper?
- A) Machine direction (MD)
- B) Cross-machine direction (CD)
- C) Thickness direction (ZD)
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Question 8 of 10

8. Question
8. What is the main cause of curl in paper?
- A) Two-sidedness in in-plane strains or structure
- B) High opacity
- C) High filler content
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Question 9 of 10

9. Question
9. What is cockling in paper?
- A) Localized out-of-plane deformations or bumps
- B) Increased gloss
- C) Increased opacity
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Question 10 of 10

10. Question
10. What is the main factor that limits cockling in heavier papers?
- A) High opacity
- B) High bending stiffness
- C) High filler content
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This page has been updated 07.01.2026

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