Test your knowledge 1

Which timber class is characterized by density more than 880 kg/m³, very high resistance to decay and insects, and typical use in marine works, heavy structural beams, bridges, outdoor decks, and piles?

• Medium Hardwood (MHW)

• Light Hardwood (LHW)

• Softwood

• Heavy Hardwood (HHW)

Which statement best describes Heavy Hardwoods (HHW) according to the material?

• They have a density range of 500–700 kg/m3 and are suitable only for indoor furniture.

• They have a density range of 880–1120 kg/m3 and are naturally durable in exposed conditions.

• They are light, non-durable woods mainly used for decorative veneers.

• They are unsuitable for bridge and decking applications due to low durability.

Which statement best distinguishes Bakau (Rhizophora spp.) from Kempas (Koompassia malaccensis spp.) in terms of durability and typical use?

• Bakau is not durable and mainly used for parquet flooring.

• Bakau is moderately durable and suitable to make poles for construction, whereas Kempas is not durable but used in heavy construction applications.

• Kempas is moderately durable and used only for decking.

• Kempas is highly durable and restricted to furniture making.

What is the primary definition of timber conversion presented in the material?

• Drying timber to reduce moisture content

• Transforming felled logs into usable wood materials through cutting, sawing, and shaping

• Preserving wood with chemical treatments

• Transporting logs from forest to market

Which of the following is NOT listed as part of the timber conversion process in the text?

• Cutting

• Sawing

• Shaping

• Painting

Which stage of timber conversion involves selecting and cutting down trees from the forest?

• Logging

• Primary conversion (sawing)

• Secondary conversion (manufacturing)

• Seasoning

According to the logging overview, where are logs taken after debarking?

• Kilns for drying

• Construction sites

• Sawmills

• Forestry nurseries

The main disadvantage of air seasoning is

• Uses too much energy

• Dries timber too fast

• akes a long time and only reaches ~20% MC

• Causes timber to burn

Kiln seasoning differs from air seasoning because it

• Uses artificial heat and humidity control

• Depends on sunlight and airflow

• Is slower and less controlled

• Requires no supervision

Defects in timber can occur

• Only during tree growth

• Only during seasoning

• Naturally or artificially

• Only during preservation