| 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In dry or green wood, a clinched nail provides 45% to 170% more withdrawal resistance than an unclinched nail when withdrawn soon after driving.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 |
|
