Timbers And Boards
Akopọ
Wood is one of the oldest engineering materials and still one of the most useful. It is a renewable, workable, surprisingly strong material that comes straight from a living tree, and the way a tree grows leaves clues in the wood - the grain, the rings, the knots - that a designer learns to read. The first and most important split is between softwoods from fast-growing evergreen trees and hardwoods from slower broadleaved trees, a classification based on the type of tree, not simply on how hard the wood feels.
This note covers the 0445 Materials-option timber objectives: classifying natural timbers, their stock forms, properties, environmental impact and uses; the named softwoods (cedar, pine, redwood, spruce) and hardwoods (oak, mahogany, meranti, jelutong); the family of manufactured boards including plywood, chipboard and MDF; and a clear-eyed comparison of when a manufactured board beats solid timber and when it does not.
Awọn Afojusun
- demonstrate knowledge of natural timbers and understand their classification, stock forms, properties, environmental impact and uses
- demonstrate knowledge of softwood timbers, for example: - cedar - pine - redwood - spruce - local equivalents
- demonstrate knowledge of hardwood timbers, for example: - oak - mahogany - meranti - jelutong - local equivalents
- demonstrate knowledge of manufactured boards, for example: - plywood - chipboard - fibre-based boards including medium density fibreboard (MDF) - local equivalents
- understand the advantages and disadvantages of working with manufactured boards compared with natural timbers.
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Timbers And Boards. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which feature defines a hardwood? A. The wood is always physically hard B. It comes from a deciduous broadleaved tree C. It is always darker than a softwood D. It cannot be used for furniture Answer: B
- Which softwood is naturally durable and most suitable for outdoor cladding without heavy treatment? A. Spruce B. Pine C. Cedar D. Jelutong Answer: C
- Why does plywood have an odd number of veneers? A. To make it cheaper B. So the grain of the outer veneers runs the same way and the panel stays balanced and flat C. To allow it to be bent into curves D. So it can be used outdoors Answer: B
- Which is a correct disadvantage of MDF compared with solid timber? A. It cannot be painted B. It is more expensive than oak C. It swells and is weakened if it gets wet, and its dust is a health hazard D. It is too strong to machine Answer: C
- Why are brass or stainless steel screws preferred to ordinary steel screws when working with oak? A. Oak is too soft for steel screws B. The tannin in oak corrodes steel and causes blue-black staining C. Steel screws are more expensive D. Oak cannot be drilled Answer: B
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Timbers And Boards? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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