Building Construction Chp. 13 quiz questions

False

Flat-sawn lumber is dimensionally more stable than quarter-sawn lumber. True False

True

From the user's view point, the difference between MC 15 and KD 15 is generally ignored. True False

b. greater than or equal to 20%.

Fungal decay in wood occurs when the moisture content in wood is a. greater than or equal to 15%. b. greater than or equal to 20%. c. greater than or equal to 25%. d. between 15% and 25%. e. none of the above.

True

Hardwoods are generally used for fine-quality flooring, furniture, and wall paneling. True False

d. approximately the same as the initial stud length of 10 ft.

A 10-ft-long stud was installed in position when the wood's moisture content was 19%. During a long dry spell, the wood's moisture content became 8%. The new stud length will be a. approximately 9 ft 10 in. b. approximately 9 ft 10 1/2in c. approximately 9 ft 11 in. d. approximately the same as the initial stud length of 10 ft. e. none of the above.

False

A lumber grade stamp must include information on the cross-sectional dimensions of lumber. True False

True

A lumber grade stamp must include the mill identification number. True False

a. actual cross-sectional dimensions.

A piece of lumber has been specified as 2 in.×4 in. in cross section. This refers to its a. actual cross-sectional dimensions. b. nominal cross-sectional dimensions.

c. 20,000 bd ft

A retailer of building materials purchased 1,000 pieces of 2×12 lumber, each 10 ft long. How many board feet did the retailer purchase? a. 1,000 bd ft b. 10 MBF c. 20,000 bd ft d. 100,000 bd ft e. None of the above

b. galvanized sheet steel.

A termite shield is generally made of a. asphalt-treated felt. b. galvanized sheet steel. c. lead sheet. d. kraft paper.

b. growth rings.

If we cut a cross section through a tree trunk, we will see a number of rings. The most appropriate term for these rings is a. annual rings. b. growth rings. c. concentric rings. d. eccentric rings. e. all of the above.

a. vertical direction.

In a 2×6 stud, the wood grain is parallel to the a. vertical direction. b. 2-in. dimension. c. 6-in. dimension.

False

In calculating the board foot measure, we must use the actual dimensions of lumber, not its nominal dimensions. True False

True

Spruce is a softwood species. True False

a. flat-sawn.

Structural lumber is typically a. flat-sawn. b. quarter-sawn. c. either (a) or (b), depending on the type of structural member.

e. none of the above

The actual dimensions of 2×12 lumber are a. 1 1/2in. x 11 in. b. 1 1/2in. x 11 1/2in. c. 1 1/2in. x 11 3/4in. d. 1 3/4in. x 11 3/4in. e. none of the above

d. 3 1/2in. × 7 1/4in.

The actual dimensions of 4×8 lumber are a. 3 1/2in. ×7 1/2in. b. 3 1/4in. ×7 1/2in. c. 3 1/4in. × 7 1/4in. d. 3 1/2in. × 7 1/4in. e. none of the above.

a. 35 pcf.

The approximate density of lumber is a. 35 pcf. b. 35 psf. c. 55 pcf. d. 55 psf. e. 75 pcf.

cells are parallel to cells along the grain

Using sketches and notes, explain why wood is stronger along the grain than across the grain.

SPF = spruce pine fir are = on gradestamp s means produced in the US

What does the term SPF mean? What is the difference between SPFs and SPF? Explain.

type of wood, quality, where the mill is, if it was dried

What information is typically provided on the grade stamp of visually graded lumber? Explain with the help of an example of a typical grade stamp.

heartwood is inner part of trunk - water rushes up it sapwood is the outside of trunk - denser

What is the difference between heartwood and sapwood? Explain.

d. Utility

Which of the following grades can only be used as blocking? a. No. 1 b. No. 2 c. Construction d. Utility e. Standard

d. Construction

Which of the following grades will not apply to a 2×8 lumber? a. No. 1 b. No. 2 c. No. 3 d. Construction

d. No. 4

Which of the following is not a lumber grade? a. No. 1 b. No. 2 c. No. 3 d. No. 4 e. Construction

a. 4 x 8

Which of the following lumber cross sections is that of a dimension lumber? a. 4 x 8 b. 6 x 8 c. 1 x 8 d. 1 x 12 e. 6 x 12

d. Cedar

Which of the following species of wood is naturally decay resistant? a. Pine b. Fir c. Spruce d. Cedar e. Hemlock

e. Redwood

Which of the following species of wood is not a hardwood? a. Teak b. Balsa wood c. Rosewood d. Oak e. Redwood

d. Oak

Which of the following species of wood is not a softwood? a. Pine b. Fir c. Cedar d. Oak e. Redwood

b. Radially sawn

Which of the following terms means the same as quarter-sawn? a. Tangentially sawn b. Radially sawn

c. Lumber and solid sawn lumber

Which of the following two terms are used synonymously? a. Lumber and wood b. Lumber and laminated veneer lumber c. Lumber and solid sawn lumber d. All of the above

d. in (c) and several other countries

Wood certified by the Forest Stewardship Council (FSC) is available a. only in the United States. b. in the United States and Canada. c. in the United States, Canada, and Mexico. d. in (c) and several other countries

a. stronger along the grain than across the grain.

Wood is a. stronger along the grain than across the grain. b. stronger across the grain than along the grain. c. equally strong in both directions of the grain.

Hard = finishing/higher density, oak maple walnut Soft = mature 3x faster, framing, makes up most of fa forests, pine, cedar, fir

Describe the essential differences between softwood and hardwood trees. Give at least three commonly used species of each.

b. western and southern regions of the United States.

In the United States, most structural lumber is grown in the a. northern region of the United States. b. western and southern regions of the United States. c. eastern and northeastern regions of the United States. d. central region of the United States. e. none of the above, because most structural lumber is imported from Mexico.

slope of grain, knots, shakes, cracks

In visually grading of lumber, what do graders typically look for in the piece of lumber? Explain.

a. only visual inspection.

Lumber used for structural framing members, such as studs, floor joists, and rafters, is graded using a. only visual inspection. b. only machine grading. c. both visual and machine grading must be used to arrive at lumber's grade.

a. from softwood species.

Lumber used for structural framing of buildings in North America is generally derived a. from softwood species. b. from hardwood species. c. from both softwoods and hardwoods, depending on the price of lumber. d. from both softwoods and hardwoods, depending on the time of the year.

c. against both fungi and termites.

Preservative-treated lumber is effective a. only against termite attack. b. only against fungal attack. c. against both fungi and termites.

e. California.

Redwood is grown mainly in a. Texas. b. Florida. c. Oklahoma. d. Arizona. e. California.

c. cross-sectional dimensions of lumber.

The basis for distinguishing lumber as board, dimension lumber, and timber is the a. species of lumber. b. strength of lumber. c. cross-sectional dimensions of lumber. d. length of lumber. e. durability of lumber.

d. hollow, long tubular cells.

The cellular structure of wood consists mainly of a. hollow, small, approximately spherical cells. b. solid, small, approximately spherical cells. c. hollow, small, approximately ellipsoidal cells. d. hollow, long tubular cells. e. either (c) or (d).

d. botanical characteristics.

The difference between softwoods and hardwoods is based on the a. strength of wood. b. density of wood. c. abrasion resistance of wood. d. botanical characteristics. e. decay resistance of wood.

a. dry.

The moisture content in a piece of lumber has been measured to be 15%. According to the wood industry, this piece of lumber will be classified as a. dry. b. green. c. wet. d. moist. e. arid.

e. surfaced when its moisture content was ≤19%.

The term S-DRY implies that the lumber has been stored in a dry climate. a. stored in a dry climate. b. sawed when its moisture content was ≤25%. c. surfaced when its moisture content was ≤25%. d. sawed when its moisture content was ≤19%. e. surfaced when its moisture content was ≤19%.

c. surfaced on two sides

The term S2S implies that the lumber has been a. sawed twice. b. sawed from two sides. c. surfaced on two sides. d. none of the above.

e. two different parts of the same tree.

The terms sapwood and heartwood refer to a. two different wood species. b. two different subspecies of wood. c. two different types of wood cells. d. two different parts of a growth ring. e. two different parts of the same tree.

c. cellulose.

The walls of wood cells consist primarily of a. calcium. b. glucose. c. cellulose. d. copper. e. lignin.

c. 11%

The weight of a piece of lumber is 2 lb. The weight of the same piece after it is fully dried is 1.8 lb. What was the original moisture content in the wood? a. 7% b. 9% c. 11% d. 15% e. None of the above