| 1. |
The inherent factors that keep wood in the forefront of raw materials are many and varied, but a chief attribute is its availability in many species, sizes, shapes, and conditions to suit almost every demand.
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True |
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False |
| 2. |
Dry wood has bad insulating properties against heat, sound, and electricity. It tends to absorb and dissipate vibrations under some conditions of use, and yet it is an incomparable material for such musical instruments as the violin.
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True |
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False |
| 3. |
The major factors other than density that can affect production of smooth surfaces during wood machining are:
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Interlocked and variable grain |
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Hard mineral deposits, |
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Reaction wood |
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All of the above |
| 4. |
The thermal conductivity of wood is affected by a number of basic factors: density, moisture content, extractive content, grain direction, structural irregularities such as checks and knots, fibril angle, and temperature. |
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True |
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False |
| 5. |
In relatively dry and moderate temperature conditions where wood is protected from deteriorating influences such as decay, the mechanical properties of wood show little change with time. |
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True |
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False |
| 6. |
What does ASTM stand for?
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American Standard for Testing and Materials |
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American Society for Testing and Materials |
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American Standard for Transportation and Materials |
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None of the above |
| 7. |
What does MFMA stand for?
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Maple Flooring Manufacturers Association |
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Main Flooring Manufacturers Association |
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Main Flooring Maple Association |
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None of the above |
| 8. |
The names used by the trade to describe commercial lumber in the United States are always the same as the names of trees adopted as official by the USDA Forest Service.
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True |
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False
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| 9. |
Modulus of elasticity E is a measure of the ability of a beam to resist deflection or of a column to resist buckling. |
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True |
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False |
| 10. |
Quality control procedures are necessary to ensure that stresses assigned by a machine-grading system reflect the actual properties of the lumber graded. |
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True |
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False |
| 11. |
The strength and stability of any structure depend heavily on the fastenings that hold its parts together. |
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True |
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False |
| 12. |
What does LRFD stand for? |
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Load and Resistance for Factor Design |
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Lumber and Resistance for Factor Design |
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Load Resistance for Factor Development |
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None of the above |
| 13. |
The strength of beams is determined by flexural stresses caused by bending moment; shear stresses caused by shear load, and compression across the grain at the end bearings and load points.
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True |
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False |
| 14. |
Adhesion is the state in which interfacial forces, which may be valence forces, interlocking action, or both, hold two surfaces together.
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True |
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False |
| 15. |
Conventional wood composite materials fall into five main categories based on the physical configuration of the wood used to make the products: plywood, oriented strandboard, particleboard, hardboard, and cellulosic fiberboard.
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True |
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False |
| 16. |
What does SCL mean?
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Structural Composite Lumber |
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Structural Concrete Lumber |
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Structural Composite Laminated |
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None of the above |
| 17. |
To meet building code and standard specifications, lumber and plywood are treated with flame-retardants to improve their fire performance. The two general application methods are:
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Pressure treating |
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Surface coating |
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1&2 |
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None of the above |
| 18. |
Wood can be protected from the attack of decay fungi, harmful insects, or marine borers by applying chemical preservatives. |
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True |
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False |
| 19. |
The texture (roughness or smoothness) of the wood surface has no effect on the selection, application, and service life of finishes. |
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True |
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False |
| 20. |
Fire prevention basically means preventing the ignition of combustible materials by controlling either the source of heat or the combustible materials. This involves proper design, installation or construction, and maintenance of the building and its contents. |
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True |
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False |
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