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Q1— Section header —
1.5\n the ANSWER BOOK.
1.1t is safe to work under suspended loads in a boiler making workshop
1.2Gas cylinders sho uld be stored in a special fire resistant storeroom.
1.3One of the safety precautions to observe when working with electricity is that electricity may be touched with wet hands.
1.4All ear protection equipment should be kept clean and free from dirt.
1.55
Q2— Section header —
2.1Give the use of each of the following hand tools:
2.1.1Centre punch
2.1.2Hacksaw
2.1.3Barrel drift
2.1.4Sledge hammer
2.1.5
2.2Name the correct marking off tool that should be used in each of the following cases
2.2.1Measuring the outside diameter of the shaft
2.2.2Marking off bevels on steel sections
2.2.3Checking the accuracy of s mall jobs
2.2.4Marking the centres of holes before it is punched
2.2.5
2.3State FOUR characteristics to consider when buying a file. (4\
2.4What is the function of a G clamp? (1\ [15] 1102206115
Q3— Section header —
Q4— Section header —
4.1Distinguish, in tabular form, between mild steel and high carbon steel with reference to each of the following:
4.1.1Carbon content
4.1.2Metal properties
4.1.3
4.2Define the term brittleness (1\
4.3Write the abbreviations of each of the following:
4.3.1Rolled steel joist
4.3.2Drawing
4.3.3
4.4Calculate the back mark of a 70 mm 90 mm 6 mm channel iron. The diameter of the hole to be drilled is 10 mm.
Q5— Section header —
5.1State FIVE safety precautions to observe when using a punch, shear and cropping machine. (5\
5.2State FIVE safety precautions to observe when using guillotine machine (5\ [10] 1102206110
Q6— Section header —
6.1
6.2Explain each of the following terms that relates to riveting:
6.2.1Landing
6.2.2
6.3Give the use of each of the following devices:
6.3.1Black bolts
6.3.210
7.1Complete the following table showing different types of cylinders used in cutting or welding by writing only the answer next to the question number (7.1.1
71.1.5\n the ANSWER BOOK. CYLINDER COLOUR THREAD TYPE Black Acetylene
7.1.3Left hand thread
7.1.4Silver
7.1.5
7.2Explain how to test oxy acetylene equipment for any gas leaks. (5\
7.3Illustrate, with the aid of a sketch, the rightward welding technique showing the direction of the weld, angle of the filler rod and angle of the gas welding torch. (3\
7.4Name T WO types of safety clothing that should be worn when working with oxy acetylene equipment. (2\ [15]15
Q8— Section header —
8.1Give the use of each of the following welding tools/equipment:
8.1.1AC welding machine
8.1.2Wire brush
8.1.3
8.2Give FIVE advantages of an AC welding machine. (5\
8.3Briefly explain the purpose of coating an electrode with flux. (3\
8.4Explain each of the following welding terms:
8.4.1Reverse polarity
8.4.215
Q9— Section header —
9.1The length required to form the internal stiffening ring
9.28