Timber Technology

Question 1

Name three parts in a cross section of a tree?

Answer 1

Bast, cambium, annual rings, pith, hardwood, growth rings, ray, sapwood, bark

Question 2

What hardwood would BEST be suited to be used to construct a staircase?

Answer 2

Oak

Question 3

What grade of plywood should be used externally on the building.

Answer 3

Weather and boil proof (WBP)

Question 4

Deciduous trees are mainly what type of tree?

Answer 4

Hardwood

Question 5

When cutting WBP plywood, what component of the board is the most hazardous to our health?

Answer 5

The Formaldehyde in the adhesive.

Question 6

What defect caused by the middle of the tree decaying?

Answer 6

Heart shake

Question 7

Is larch a hard or softwood?

Answer 7

Softwood

Question 8

Explain what a natural defect in timber is?

Answer 8

A defect that happens when the tree is growing.

Question 9

Explain what a seasoning defect in timber is?

Answer 9

A defect that happens when the timber is being dried.

Question 10

What method of timber conversion is used to produce joist section timber?

Answer 10

Tangentially sawn.

Question 11

What method of conversion will produce “Silver” grain in oak timber?

Answer 11

Quarter sawn.

Question 12

What method of conversion is used to produce timber where the centre of the tree is rotten?

Answer 12

Boxed heart

Question 13

Is Mahogany a hard or softwood?

Answer 13

Hardwood

Question 14

Is a dead knot a natural or seasoning defect?

Answer 14

Natural defect.

Question 15

What is the ideal moisture content for a piece of timber which is to be fixed externally would be:

Answer 15

18 - 20 percent moisture content.

Question 16

State two methods of seasoning timber?

Answer 16

Air and kiln drying.

Question 17

What would be the ideal moisture content for a piece of timber which is to be placed next to a central heating radiator?

Answer 17

6 - 9 percent moisture content.

Question 18

What is the most effective method of applying timber preservative?

Answer 18

Pressure treatment.

Question 19

How is timber graded?

Answer 19

Visually and mechanically

Question 20

C16 is a timber classification. What attribute of the timber does this refer to?

Answer 20

Strength (Stress Graded).

Question 21

Is Douglas fir a hard or softwood?

Answer 21

Softwood.

Question 22

Is twist (wind) a natural or seasoning defect?

Answer 22

Seasoning defect.

Question 23

Is cupping a natural or seasoning defect?

Answer 23

Seasoning defect.

Question 24

What timber that is creamy white with occasional dark streaks, and can be used for building furniture, boats, and tool handles.

Answer 24

Ash

Question 25

Which type of timber seasoning is better for the environment?

Answer 25

Air drying, no heat required

Question 26

What type of defect occurs when timber is seasoned too rapidly and the outside dries, sealing the inside?

Answer 26

Case hardening

Question 27

Is a thunder shake a natural or seasoning defect?

Answer 27

Natural defect

Question 28

How can wet rot be eradicated?

Answer 28

Cut out the rot and replace with new timber and remove the source of wetness.

Question 29

Is Twist (wind) a natural or seasoning defect?

Answer 29

Seasoning defect.

Question 30

state 2 ways preservative can be applied to timber?

Answer 30

Brush, spray, dipping, under pressure.

Question 31

What is the most effective type of preservative is:

Answer 31

Organic solvent

Question 32

A manmade board with compressed wood flakes is called what?

Answer 32

Sterling board (OSB)

Question 33

A manmade board with a odd number of layers bonded together at right angles to each other is called?

Answer 33

Plywood.

Question 34

What grade of plywood could be used in extreme weather conditions?

Answer 34

Weather and boil proof (WBP).

Question 35

What does MDF stand for in relation to man-made boards?

Answer 35

Medium density fibreboard

Question 36

A board material used to finish walls and available in moisture resistant, fire resistant and acoustic grades is best known as what?

Answer 36

Plasterboard.

Question 37

Is Cedar a hard or a softwood?

Answer 37

Softwood

Question 38

Is Ash a hard or softwood?

Answer 38

Hardwood.

Question 39

Explain what is meant by botanical differences in relation to timber.

Answer 39

Hardwoods loose their leaves, have fruit, broad leaves, complex cell structures. Softwood, evergreen, have cones & needles, simple cell structure.

Question 40

What is the purpose of the bark on a tree?

Answer 40

To protect the tree from insect attack.

Question 41

Why are trees important to human life?

Answer 41

They take in carbon dioxide and gives out oxygen (photosynthesis).

Question 42

Explain evergreen in relation to botanical differences of timber.

Answer 42

Softwood trees are evergreen

Question 43

Which method of timber conversion produces strong timber that could be used for structural timber?

Answer 43

Tangentially sawn

Question 44

Which method of timber conversion is the most economic and produces very little waste.

Answer 44

Through and through

Question 45

Which section of the tree is the active part that takes the nutrients to the leaves?

Answer 45

Sapwood

Question 46

Which section of the tree produces the most durable wood?

Answer 46

Heartwood