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Natural fibre products Quiz 24

Theme: Natural Fibre Products NFP Quiz 24 Natural fibre products Quiz 24

Natural fibre products Quiz 24

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Question 1 of 10

1. Question
1. What is tensile strength commonly used to characterize?
- A) The chemical properties of paper and board
- B) The mechanical properties of paper and board
- C) The thermal properties of paper and board
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Question 2 of 10

2. Question
2. What usually triggers failure in paper webs at stress levels that are a fraction of tensile strength?
- A) High temperatures
- B) Excessive moisture
- C) Flaws
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Question 3 of 10

3. Question
3. What is fracture toughness a measure of?
- A) Paper's ability to absorb water
- B) Paper's ability to resist the growth of small incipient cracks
- C) Paper's ability to conduct electricity
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Question 4 of 10

4. Question
4. What is the Griffith criterion related to?
- A) The condition for paper's thermal expansion
- B) The condition for paper's water absorption
- C) The condition for crack growth in a linearly elastic body
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Question 5 of 10

5. Question
5. What does the fracture energy divided by damage width relate to?
- A) Paper's moisture content
- B) Inter-fibre bonding energy times damage width
- C) Paper's color intensity
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Question 6 of 10

6. Question
6. What is the main cause of web breaks in high-speed printing presses?
- A) High ambient temperature
- B) Excessive ink usage
- C) Defects in the paper or transient peaks in web tension
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Question 7 of 10

7. Question
7. What does the elastic breaking strain of paper relate to?
- A) The ratio of tensile strength to elastic modulus
- B) The ratio of tensile strength to moisture content
- C) The ratio of tensile strength to thermal conductivity
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Question 8 of 10

8. Question
8. What is the Weibull distribution used to describe?
- A) The strength distribution of paper
- B) The color distribution of paper
- C) The moisture distribution of paper
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Question 9 of 10

9. Question
9. What does the zero-span strength measurement indicate?
- A) The macroscopic failure triggered by fibre rupture
- B) The moisture absorption rate
- C) The thermal expansion rate
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Question 10 of 10

10. Question
10. What is the critical factor for failure in paper with poor formation?
- A) The ratio of local strength or local strain over the local breaking strain
- B) The ratio of local moisture content
- C) The ratio of local thermal conductivity
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This page has been updated 07.01.2026

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