| 1. | The strength and stability of any structure depend heavily on the fastenings that hold its parts together. |
| | True |
| | False |
| 2. | What does LRFD stand for? |
| | Load and Resistance for Factor Design |
| | Lumber and Resistance for Factor Design |
| | Load Resistance for Factor Development |
| | None of the above |
| 3. | Nails are the most common mechanical fastenings used in wood construction |
| | True |
| | False |
| 4. | What does figure 7-2 illustrate about?
(Refer Pg 7-1) |
| | Various types of nails |
| | Steel Side Plates |
| | Metal Plate Connectors |
| | None of the above |
| 5. | The resistance of a nail shank to direct withdrawal from a piece of wood depends on the density of the wood, the diameter of the nail, and the depth of penetration. |
| | True |
| | False |
| 6. | The surface condition of nails is frequently modified during the manufacturing process to improve withdrawal resistance. |
| | True |
| | False |
| 7. | The form and magnitude of the deformations along the shank does not influence the performance of the nails in various wood species. |
| | True |
| | False |
| 8. | Fasteners with properly applied nylon coating tend to retain their initial resistance to withdrawal compared with other coatings, which exhibit a marked decrease in withdrawal resistance within the first month after driving. |
| | True |
| | False |
| 9. | In dry or green wood, a clinched nail provides 45% to 170% more withdrawal resistance than an unclinched nail when withdrawn soon after driving. |
| | True |
| | False |
| 10. | The nailing characteristics of plywood are not greatly different from those of solid wood except for plywood’s greater resistance to splitting when nails are driven near an edge. |
| | True |
| | False |
| 11. | The resistance of nails to withdrawal is generally lowest when they are driven perpendicular to the grain of the wood. |
| | True |
| | False |
| 12. | As a general rule, nails should be driven no closer to the edge of the side member than one-half its thickness and no closer to the end than the thickness of the piece. |
| | True |
| | False |
| 13. | The load in lateral resistance varies approximately as the 3/2 power of the diameter when other factors, such as quality of metal, type of shank, and depth of penetration, are similar to nails. |
| | True |
| | False |
| 14. | What does figure 7-5 illustrate about?
(Refer Pg 7-9) |
| | Common types of wood screws |
| | Steel Side Plates |
| | Metal Plate Connectors |
| | None of the above |
| 15. | Deformed-shank nails carry somewhat lower minimum lateral loads than do the same pennyweight common wire nails, but both perform different at small distortions in the joint. |
| | True |
| | False |
| 16. | The resistance of wood screw shanks to withdrawal from the side grain of seasoned wood varies directly with the square of the specific gravity of the wood. |
| | True |
| | False |
| 17. | The proportional limit loads obtained in tests of lateral resistance for wood screws in the side grain of seasoned wood are given by the empirical equation
p = KD2
What does D mean in the above formula? |
| | Diameter of the screw shank |
| | Design formula |
| | Design value of the screw |
| | None of the above |
| 18. | Lag screws are commonly used because of their convenience, particularly where it would be difficult to fasten a bolt or where a nut on the surface would be objectionable. |
| | True |
| | False |
| 19. | What does figure 7-10 illustrate about?
(Refer Pg 7-12) |
| | Multiplication factors for loads computed from Equation |
| | A, Clean-cut, deep penetration of thread |
| | Scholten nomograph |
| | None of the above |
| 20. | The bearing stress under a bolt is computed by dividing the load on a bolt by the product LD, where L is the length of a bolt in the main member and D is the bolt diameter. |
| | True |
| | False |
| 21. | Both the properties of the wood and the quality of the bolt are factors in determining the strength of a bolted joint. |
| | True |
| | False |
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