This set of Pulp and Paper Multiple Choice Questions and Answers (MCQs) focuses on “Softwood Fiber”.
1. Fibers over ____________ millimetre long are most often softwood fibers.
Explanation: Fibers over 2 millimetre long are most often softwood fibers.
2. Ray cross—field pitting in softwoods is the principal means of many ray cross field pits shows if ray tracheids are present, whether they are marginal or interspersed, and might indicate the average height of the rays.
Explanation: Cross-field pitting referres to the pores b/w the ray parenchyma cells and the vertical tracheids. The pores b/w the ray tracheids, if the ray tracheids are present, are diff. Cross-field pitting is somewhat variable within a growth ring so it is best to consider the first two or three rows of early wood.
3. Spruce, larch, and hemlock might be able to be distinguished from each other as with true—fir and western redcedar.
Explanation: Spruce, larch, and hemlock might not be able to be distinguished from each other as with true—fir and western redcedar. If the source of the pulp is known then regional information could be utilized.
4. Which of the following is made from Softwood fiber?
c) Grocery bags
Explanation: Softwood fibers from commonly utilized papermaking species such as pine, spruce, alpine fir, and Douglas fir have tracheid fibers nearly 3 millimeter long and 20 to 30 millimeter thick.
Explanation: Douglas fir, with the scientific name Pseudotsuga menziesii, is an evergreen conifer species found in western North America.
Explanation: They grow very well in the acidic red clay soil found in a lot of the region. The species include Loblolly, longleaf, shortleaf, and slash pines.
Explanation: Eastern White Pine is the largest pine tree in Virginia. It grows over 100 feet. and has a straight trunk up to 4 feet. wide.
Explanation: It’s a large coniferous evergreen tree growing to almost 100 meter (330 feet) tall, and with a trunk diameter at breast height that could be greater than 5 meter (16 feet).
Explanation: It’s a species of hemlock found in the west coast of North America, with its north western limit on the Kenai Peninsula, Alaska, and its south eastern limit in northern Sonoma County.
Explanation: Western Redcedar is a commercially crucial lumber, utilized in a number of applications ranging from rough-sawn lumber for utilize in home construction to clear quarter sawn material for classical guitar.
Sanfoundry Global Education & Learning Series – Pulp and Paper.
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