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Natural fibre products Quiz 33

Theme: Natural Fibre Products NFP Quiz 33 Natural fibre products Quiz 33

Natural fibre products Quiz 33

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Question 1 of 10

1. Question
1. What does out-of-plane strength in paper measure?
- A) The opacity of the paper
- B) The gloss of the paper
- C) The ability to resist tensile stress in the thickness direction
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Question 2 of 10

2. Question
2. Which test is commonly used to measure out-of-plane strength?
- A) Cobb test
- B) Tensile index test
- C) Scott bond test
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Question 3 of 10

3. Question
3. What effect does increasing density generally have on out-of-plane strength?
- A) It decreases strength
- B) It has no effect
- C) It increases strength
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Question 4 of 10

4. Question
4. Which structural property most significantly increases delamination resistance?
- A) High filler content
- B) Interwoven or felted fibre network
- C) High opacity
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Question 5 of 10

5. Question
5. What is the main effect of fillers on out-of-plane strength?
- A) Fillers generally reduce strength
- B) Fillers always increase strength
- C) Fillers have no effect
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Question 6 of 10

6. Question
6. What is the main transport direction for fluids in paper?
- A) In-plane
- B) Thickness direction (z-direction)
- C) Machine direction
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Question 7 of 10

7. Question
7. What is the main factor controlling permeability in paper?
- A) Porosity
- B) Colour
- C) Grammage
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Question 8 of 10

8. Question
8. What is the Lucas-Washburn equation used for?
- A) Predicting ink gloss
- B) Describing capillary penetration of liquids into paper
- C) Measuring tensile strength
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Question 9 of 10

9. Question
9. What is the effect of hydrophobic sizing on water penetration?
- A) Strong decrease in penetration
- B) Strong increase in penetration
- C) No effect
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Question 10 of 10

10. Question
10. What is superhydrophobic paper characterized by?
- A) Water contact angles above 150°
- B) High opacity
- C) High compressive strength
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This page has been updated 07.01.2026

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