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Q1— Section header —
1.10in the ANSWER BOOK.
1.1.1Sapwood is the centre of the tree trunk.
1.1.2The term timber is given to a tree after it has been sawn.
1.1.3tree that bears cones is an angiosperm.
1.1.4Hardwood can be used to make furniture and paper and can even be used in construction.
1.1.5Felling is a process of cutting down trees. 1.
1.6Structural timber is isotropic material.
1.1.7Distortion is the breaking of timber into two pieces.
1.1.8A k not is the area where the tree grew a branch that was later cut off.
1.1.9Early wood is represented by the dark area on the gr owth ring.
1.1.10
1.2Show by means of a sketch how the following information appears on timber:
1.2.1Manufacturer's name or trademark
1.2.2The verification mark
1.2.3Method of grading
1.2.4Strength grade
1.2.515
Q2— Section header —
2.1Give ONE word or term for each of the following des criptions. Write only the word or term next to the question number (2.1 .1 2. 1. 10\in the
2.1.1The process of cut ting metal using different saws
2.1.2The process of cutting metal into different sizes and shapes using torch flame
2.1.3The proces s of neatening edges of a metal
2.1.4The process of cutting metal sheets accurately
2.1.5The process of perforating (mak ing row of holes\ a metal sheet
2.1.6The process of strengthening metal by stra ining it beyond its yield point
2.1.7The process of changing metal properties by heat treatment
2.1.8The process of stretching m etal by means of tensile forces
2.1.9The process of cu tting metal with a plasma torch
2.1.10The technology that uses a laser to cut through a metal (10 1\ (10\
2.2Name and explain THREE different methods of cutting metals. (6\
2.3Distinguish between a pure metal and alloy and give examples of each as commonly used in construction
Q3— Section header —
3.1Differentiate between mild steel and high te nsile steel. (4\
3.2Explain the following terms that appl when steel is under stress.
3.2.1Plastic deformation
3.2.2Yield point
3.2.3
3.3Show by means of sketch the following steel sections:
3.3.1section
3.3.2Lipped angle
3.3.3
3.4Discuss the role of the hand ing over certificate after completion of the steel structure
Q4— Section header —
4.1Briefly discuss the following methods of preve nting steel corrosion
4.1.1Drainage design
4.1.2Painting
4.1.3Hot dip galvanising
4.1.4Electroplating
4.1.5
4.2List THREE g roups of stainless steel alloys. (3\
4.3State TWO methods you can use to protect steel from corrosion (2\ [15 (12010273\
Q5— Section header —
5.1Write the following abbreviations in full:
5.1.1AWS
5.1.2WPS
5.1.3SMAW
5.1.4FCAW
5.1.5SAW
5.1.6MMAW (6 1\ (6\ 5. List FIVE advantages of welding
5.3Explain the importance of welding in a well ventilated workshop. (2\
5.4Explain the main difference between b razing and soldering. (2\
5.5Name FIVE different methods of fusion welding to join st eel. (5\ [20]20
Q6— Section header —
6.1Toughened glass
6.2Laminated glass
6.3Wired glass
6.4Float glass
6.510