Gray colour in photodegraded wood is a result of O a. extractives migration to the wood surface O b. colonisation by moulds and staining fungi O c. degradation of white-coloured cellulose
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- A 50mm x 50mm x 100mm freshly cut wood has a mass of 600 grams. After oven drying, the specimen’s mass reduces to 250 grams. What is the moisture content of the freshly cut wood?33 - Which of the following judgments is wrong for wood?A) It is possible to greatly increase the fire resistance of wood by injecting borax and aluminum salt chemical liquids into logs or coating them with non-flammable materials.B) Logs are cut mainly in 4 ways; parallel mower, prismatic mower, quarter mower and half mower.C) Dipping is the deep protection type of wood.D) It is immersed in a short or long-term hot antiseptic bath depending on the type of wood. For these baths, materials such as copper sulphate, zinc chloride and lysol are mostly used.E) The most negative side of wooden material is its lack of fire resistance. Impossible to completely save lean wood from fire effectThe moisture content of wood test was performed according to AST D4442 procedure and produced the following data: Weight of specimen in the green condition = 317.5 g Weight of oven-dry specimen = 203.9 g Calculate the moisture content of the given wood.
- The moisture content of wood test was performed according to ASTM D4442procedure and produced the following data:Weight of specimen in the green condition = 317.5 gWeight of oven-dry specimen = 203.9 gCalculate the moisture content of the given wood.USE 2015 NSCPWhat are the emission rates of formaldehyde from fiberwood?
- Untreated wood can deteriorate when four conditions required for decay andinsects occur. States these four conditions.A. Differentiate the types of seasoning of lumber. 1. Methods of Seasoning of Lumber 2. Artificial Seasoning of Lumber B. Give at least 5 common causes of wood decay. C. Types of Preserving Wood ProcessThe moisture content of wood test was performed according to ASTM D4442procedure and produced the following data:Mass of specimen in the green condition = 317.5 gMass of oven-dry specimen = 203.9 gCalculate the moisture content of the given wood.
- A 250-mm wide red spruce plank is cut at the mill at a moisture content of 50% in such a way that the width is in the tangential direction of annual rings. What is the new width as the moisture content changes to 15%? The fiber saturation point of red spruce is 27%, and it shrinks 7.8% (of the green dimension) in drying from FSP to oven dry in the tangential direction.A wood pole with a diameter of 10 in. has a moisture content of 5%. The fibersaturation point (FSP) for this wood is 30%. The wood shrinks or swells 1%(relative to the green dimensions) in the radial direction for every 5% changein moisture content below FSP.a. What would be the percent change in the wood’s diameter if the wood’smoisture is increased to 55%?b. Would the wood swell or shrink?c. What would be the new diameter?Blk gkl