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Natural fibre products Quiz 31

Theme: Natural Fibre Products NFP Quiz 31 Natural fibre products Quiz 31

Natural fibre products Quiz 31

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Question 1 of 10

1. Question
1. What property measures the ability of paper to resist the growth of small cracks?
- A) Tensile strength
- B) Fracture toughness
- C) Grammage
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Question 2 of 10

2. Question
2. What is the main cause of web breaks in high-speed printing presses?
- A) Local defects or flaws in the paper
- B) Poor opacity
- C) High grammage
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Question 3 of 10

3. Question
3. Which theory is commonly used to connect tensile strength to the average properties of microscopic constituents in paper?
- A) Microscopic bond theory
- B) Continuum fracture mechanics
- C) Fibre pull-out theory
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Question 4 of 10

4. Question
4. True or False: The tensile strength of a paper web is always equal to the minimum local strength value in the web.
- A) True
- B) False
- C) Only for mechanical pulps
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Question 5 of 10

5. Question
5. What is the Weibull exponent (β) typically used to describe in paper strength analysis?
- A) The heterogeneity and distribution of strength values
- B) The degree of fibre orientation
- C) The average grammage
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Question 6 of 10

6. Question
6. What does the zero-span strength measurement primarily indicate?
- A) The bonding degree between fibres
- B) The fibre strength parallel to the elongation direction
- C) The strength of the fibres themselves
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Question 7 of 10

7. Question
7. Which factor has the strongest effect on the elastic breaking strain of paper?
- A) Wet pressing
- B) Beating
- C) Beating (for every 100 kg/m³ increment in density, the change is about 0.4%)
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Question 8 of 10

8. Question
8. What is the main use of fracture toughness and tear strength measurements in papermaking?
- A) To determine opacity
- B) To evaluate reinforcement efficiency of chemical pulps
- C) To evaluate the runnability of printing papers made from mechanical pulp
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Question 9 of 10

9. Question
9. True or False: The addition of chemical pulp to mechanical pulp always linearly increases tensile strength.
- A) True
- B) Only for high-density pulps
- C) False
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Question 10 of 10

10. Question
10. What is the main effect of high drying shrinkage on the elastic modulus of paper?
- A) It increases the modulus
- B) It has no effect
- C) It decreases the modulus
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This page has been updated 07.01.2026

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