Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Materials > Wood > Flashcards

Wood Flashcards

1
Q

wood has [] compressive and tensile strength

A

high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

wood has relatively [] density

A

low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

wood is readily [] and [] cost

A

available
low cost

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

wood has good [] properties and [] fire behaviour

A

thermal
predictable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

wood can be sustainable if it harvested from a [] forest

A

sustainable forest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what does it mean when the properties of wood vary in different directions?

A

it is anisotropic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

wood often contains inherent []

A

flaws

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

the harvesting of wood is often associated with

A

high transport costs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

wood is susceptible to attack from

A

insects, bacteria and fungi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

wood must be [] before use

A

dried

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

wood has [] embodied energy consumption

A

low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What do we mean when we say wood has a low embodied energy?

A

converting timber into a usable material takes far less energy and generates far fewer greenhouse gases than other mainstream alternatives

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

wood is a good [] material

A

insulating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what does FSC stand for?

A

forest stewardship council

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what does the FSC do?

A

promote responsible management of the world’s forests

combat illegal and unethical logging

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

timber is an [],[] and naturally [] building material

A

organic
non-toxic
renewable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

forests act as

A

carbon sinks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what are the components of dry wood and their proportions?

A

cellulose 50%

hemicellulose and pectin 20%

lignin 25%

extractives 5%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

50% of the dry weight of earth’s biomass is in the form of

A

glucose polymers

20
Q

glucose has a [] structure

A

ring

20
Q

glucose has a [] structure

A

ring

21
Q

cellulose has a [] structure, held together with [] bonds

A

crystalline structure
hydrogen bonds

22
Q

lignin is a massive random [] of []

A

polymer
phenylpropane alcohol

23
Q

as cut wood has a moisture content of

A

85%

24
Q

the structure of wood from centre to exterior is

A

heartwood
sapwood
vascular cambium (green membrane)
bark (living phloem)
cork

25
Q

heartwood and sapwood have the same []

A

strength

26
Q

softwood comes from which tree?

A

coniferous

27
Q

hardwood comes from which tree?

A

deciduous

28
Q

under the microscope, a cross section of wood looks like

A

a collection of straws, which water flows through

29
Q

hardwoods are obtained from tress such as

A

oak, ash, beech, teak mahogany

30
Q

The microstructure of wood can be described as

A

inelastic
fibrous
porous
biodegradable
hygroscopic

31
Q

along the grain how does wood far in tension, compression and shear?

A

strong
strong
weak

32
Q

across the grain how does wood far in tension, compression and shear?

A

weak
weak
strong

33
Q

why does wood exhibit viscoelasticity?

A

lignin which is an amorphous polymer

34
Q

How does the compressive strength of wood change with an increasing moisture content?

A

compressive strength weakens remarkably

35
Q

at which moisture content is wood able to rot?

A

> 25%

36
Q

which kind of insects can damage wood?

A

furniture beetle
death watch beetle
house longhorn
powder post beetle
pinhole borer
wood wasps

37
Q

What are examples of structural timber composites

A

glulam

oriented strand-board

laminated veneer lumber

parallel strand lumber

laminated strand lumber

prefabricated I-joists

38
Q

Glulam has [] structural properties than wood

A

better

39
Q

glulam exhibits dimensional []

A

stability

40
Q

glulam exhibits less material []

A

variability

41
Q

What is glulam?

A

planks of wood glued together to form larger sections

42
Q

what are some typical uses for glulam?

A

beams and columns
domes, curved roofs and arches
footbridges

43
Q

How is laminated veneer lumber produced?

A

bonding 3mm thick veneers peeled from a log

44
Q

How is parallel strand lumber made?

A

cutting peeled veneers into long strands
coating with glue
combing with heat and pressure

Materials (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions