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2.1Name FIVE points to remember before starting to use a hacksaw blade. (5\
2.2State the function of each of the following hand tools:
2.2.1Ball peen hammer
2.2.3Parallel drift
2.2.3Flat file (3 1\ (3\
2.3Describe the purpose of each of the following marking off tools:
2.3.1Chalk line
2.3Inside calipers
2.3Try square
2.3Bevel gauge (4 1\ (4\
2.4Calculate the hypotenuse of the right angled triangle of a 12 mm thick mild steel plate. The base and the height are 185 mm and 350 mm respectively. HINT: R = X
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3.1Construct the line of penetration between the two pipes (2\
3.2Show the shape of the hole in the main pipe. (2\
3.3Calculate the circumference of the 50 mm diameter branch pipe. (2\
3.4With the aid of drawing instruments, develop the pattern of the branch pipe. HINT: C = 3,142 (4\ [10] 1102206110
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4.1Distinguish, in tabular form, between mild steel and high carbon steel with reference to the following:
4.1.1Carbon content
4.1.2Metal properties
4.1.3Uses (3 2\ (6\
4.2Define the term brittleness (1\
4.3Write down the abbreviations for the following:
4.3.1Rolled steel joist
4.3.2Drawing
4.3.3Outside diameter (3 1\ (3\
4.4You need to drill a hole with a diameter of 10 mm. Calculate the back mark of the 70 mm x 90 mm x 6 mm channel iron. (2\ [12]12
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5.1Name FIVE safety precautions to be observed when using a punch, shear, and cropping machine. (5\
5.2Name FIVE safety precautions to be observed when using guillotine (5\ [10]10
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6.1Name THREE types of rivet heads used in assembly. (3\
6.2Explain the following terms used in fabrication work:
6.2.1Landing (1\
6.2.2Pitch (1\
6.3Calculate the length of a black bolt that will be used for assembling THREE 12 mm thick steel plates. The maximum diameter of the hole to be drilled is 18 mm. (3\ Explain the use of countersunk bolt
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7.1State the function of each of the following gas apparatus:
7.1.1Welding torch
7.1.2Acetylene gas cylinder
7.1.3Pressure regulator
7.1.4Flash back arrestor
7.1.5Welding hose (5 1\ (5\
7.2Describe the following oxyacetylene gas flame settings and their function:
7.2.1Neutral flame (2\
7.2.2Oxidising flame (2\
7.3State FOUR causes of backfire during gas cutting (4\
7.4Explain how to extinguish the flame in the oxyacetylene welding process (2\ [15]15
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8.1Define the term shielded arc welding process (2\
8.2Name SIX types of protective clothing that should be worn during arc welding and give reason for each. (6\
8.3Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only rue or
8.3.3\ the ANSWER BOOK.
8.3.1Porosity is the result of an incorrect welding rod.
8.3.2Slag protects the weld from atmospheric pollution.
8.3.3Low current results in good welding joint. (3 1\ (3\
8.4State FOUR disadvanta ges of using a direct current welding machine. (4\ [15] 1102206115
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9.1The length required to form the internal stiffening ring
9.2The length required to form the external stiffening ring (2 4\ [8] TOTAL: 100 (11022061\ T1140(8
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