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Natural fibre products Quiz 21

Theme: Natural Fibre Products NFP Quiz 21 Natural fibre products Quiz 21

Natural fibre products Quiz 21

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Question 1 of 10

1. Question
1. What are the main applications where the thermal properties of paper are relevant?
- A) Water resistance and durability
- B) Packaging and shipping
- C) Drying, supercalendering, some printing processes, and thermal insulation
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Question 2 of 10

2. Question
2. What is the primary factor that determines the friction of paper?
- A) Surface roughness
- B) Paper thickness
- C) Surface chemistry
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Question 3 of 10

3. Question
3. How does the roughness of the paper surface affect its printing properties?
- A) It affects the color of the ink
- B) It affects optical properties such as gloss, the absorption of ink, and the required amount of coating
- C) It affects the weight of the paper
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Question 4 of 10

4. Question
4. What are the three components of roughness according to the in-plane resolution?
- A) Surface roughness, internal roughness, and edge roughness
- B) Chemical roughness, physical roughness, and thermal roughness
- C) Optical roughness, micro roughness, and macro roughness
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Question 5 of 10

5. Question
5. What is the most common measure of roughness in paper?
- A) The average height of surface peaks
- B) The root mean square (RMS) deviation of surface height
- C) The depth of surface valleys
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Question 6 of 10

6. Question
6. How does the thermal conductivity of paper change with moisture content?
- A) It remains constant regardless of moisture content
- B) At low moisture contents, apparent thermal conductivity increases dramatically due to water vapour convection. At high moisture contents, it declines
- C) It decreases as moisture content increases
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Question 7 of 10

7. Question
7. What is the effect of calendering on the roughness and thickness of paper?
- A) Calendering increases surface roughness and thickness
- B) Calendering decreases surface roughness more than thickness
- C) Calendering has no effect on roughness and thickness
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Question 8 of 10

8. Question
8. What is the coefficient of static friction and how is it defined?
- A) The force required to start sliding divided by the normal force
- B) The force required to keep sliding divided by the normal force
- C) The force required to lift the paper divided by the normal force
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Question 9 of 10

9. Question
9. What are the main mechanisms of heat transfer in paper?
- A) Conduction, convection, and radiation
- B) Absorption, reflection, and transmission
- C) Diffusion, osmosis, and evaporation
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Question 10 of 10

10. Question
10. How does the specific heat of paper relate to its ability to store thermal energy?
- A) The specific heat capacity reflects the ability of the material to store thermal energy
- B) The specific heat capacity reflects the ability of the material to conduct thermal energy
- C) The specific heat capacity reflects the ability of the material to resist thermal energy
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This page has been updated 07.01.2026

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