This set of Pulp and Paper Multiple Choice Questions and Answers (MCQs) focuses on “Wood and Bark”.
1. What is the percentage, bark comprises of in a tree stem?
a) 10% – 20%
b) 30% – 40%
c) 41% – 62%
d) 7% – 30%
View Answer
Explanation: Because of complex analogy and chemistry, this percentage is the most observed in most of the species.
2. What are some high level non-process elements which interfere in the recovery process?
a) Carbon Dioxide and Oxygen
b) Lead and Other Impurities
c) Silica and Calcium
d) Silicate and Copper
View Answer
Explanation: These are the impurities which gets added while the extraction.
3. Whole tree ___ in the forest requires cleaning before pulping to remove dirt.
a) Flipping
b) Burning
c) Cutting
d) Chipping
View Answer
Explanation: This practice will become important in future as it gives higher yield to remove needles, leaves, twigs, etc.
4. What does the outer bark contain?
a) Suberin
b) Hardwood
c) Wood Pole Conference
d) Pith
View Answer
Explanation: These are the Polyesters of dicarboxylic acids with C 16 to C 24 structures and bifunctional alcohol among molecules.
5. What is the specific gravity of the bark in usual cases?
a) 0.90 – 1.45
b) 0.40 – 0.65
c) 0.45 – 0.90
d) 1.24 – 2.00
View Answer
Explanation: This is of mature bark. This value of ‘g’ is used in calculations.
6. Where is Sapwood located in the structure of softwood stem?
a) Below Inner Bark
b) Below Outer Bark
c) Below Wood Ray Heartwood
d) Above Pith
View Answer
Explanation: It contains the living cells, so it is situated near the outer part.
7. What type of trees are also called deciduous?
a) Softwood
b) Hardwood
c) Lightwood
d) Heavywood
View Answer
Explanation: These trees lose their leaves in winter. These have complex structure including vessel elements, fiber tracheids, rays cells and etc.
8. What are openings on the radial surface known as?
a) Pits
b) Pith
c) Reaction Wood
d) Mitochondria
View Answer
Explanation: They allow the movement of liquids up and down the tree. This also depends on the length of the tree.
9. What is solid wood density, practically?
a) Specific gravity of wood x Density of water
b) Specific gravity of pulp x Density of water
c) Specific gravity of paper x Density of water
d) Specific gravity of impurity x Density of Liquid
View Answer
Explanation: This is the specific density value used in manufacturing unit.
10. What are some important pulping variables of wood and wood chip?
a) Bark content
b) Spring wood
c) Summer wood
d) Autumn wood
View Answer
Explanation: Mills recovering extractives use FIFO to obtain high terpene recoveries.
Sanfoundry Global Education & Learning Series – Pulp and Paper.
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