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Q1— Section header —
1.1FIGURE 1 below, shows a pedestal drilling machine. Name the components E by writing only the name next to the letter (A E\the ANSWER BOOK
1.2Name TWO safety precautions to be taken into account when working with punching machine. (2\
1.3Briefly describe the working principle of the cropper on a punch and shearing machine. (3\ [10]10
Q2— Section header —
2.1The heel diameter of a 60 60 6 mm external angle iron ring is 196 cm. Calculate the length in millimeters of angle
2.2FIGURE 2 below , shows a top view of an angle iron frame. Calculate the length of the angle iron required to manufacture the frame. FIGURE 2 (5\ [10]10
Q3— Section header —
3.1Describe the purpose of an assembly jig. (3\
3.2Name THREE requirements with which a well designed welding jig should comply. (3\
3.3FIGURE 3 below , shows two plate edges with a wide gap between them. Describe, with the aid of sketch, a simple device made from scrap metal available in the workshop to bring together the plate edges closer for welding.
Q4— Section header —
4.1FIGURE 4 below shows a center finder. Name the parts A by writing only the name and the use of each part next to the letter (A
4.2Describe with the aid of a free hand drawing, how to determine the saddle depth of a T piece of unequal diameter pipes. (4\
Q5— Section header —
5.1The span of a simple roof truss is 8 meter and the rafter is 4.472 meter. Calculate the following:
5.1.1Rise (3\
5.1.2Pitch (3\ [6]6
Q6— Section header —
6.1List FOUR information items that should be indicated on the template. (4\
6.2Name two uses of template. (2\ [6] (11022182\ Copyright reserved Please turn over6
Q7— Section header —
7.1Briefly describe the difference between ferrous and non ferrous metals. (2\
7.2Indicate whether the following statement is TRUE or FALSE next to question
7.2In the ANSWER BOOK. Manganese improves grain structure, corrosion resistance and magnetic properties . (1
7.3Write TWO effects on steel when separately alloyed with each of the following elements
7.3.1Nickel (2\
7.3.2Vanadium (2\ [8]8
Q8— Section header —
8.1Briefly describe the effect of the following on the quality of a gas cut surface:
8.1.1Pre heating flame too low
8.1.2Nozzle too far from surface
8.1.3Pre heating flame too high
8.1.4Irregular torch travel (4 2\ (8\
8.2Briefly describe the TWO effects on the quality of a gas cutting on the surface, if the nozzle is too high from the surface. (2\
8.3Briefly explain what is meant by brazing (2\ [12]12
Q9— Section header —
9.1Sketch a compound welding symbol large enough to show the following elements clearly:
9.1.1Double V butt weld symbol (2\
9.1.2Arrow (1\
9.1.3Reference line (1\
9.1.4Symbol for machine finish (1\
9.1.5Tail (1\ (11022182\ Copyright reserved
9.2Define the term undercut (3\
9.3Name SIX causes of undercut. (6\ [15]15
Q10— Section header —
10.1Determine the mass of the following sections from the given weight in TABLE 1 below:
10.1.1
10.1.2
9.4210
15.712
18.814
22.016
37.718
63.520
70.625
88.230
94.2106.0 35
96.1110.0 124.0 TABLE 1
10.2The following data regarding a close tank is available: Inside diameter = 1800 mm Inside height = 1100 mm Thickness of plate = 12 mm Calculate the mass of the plate to manufacture the tank if 1 mm thickness