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Q1— Section header —
1.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.1.1
1.1.10\in the ANSWER BOOK.
1.1.1The fill et weld symbol is a small right angled triangle
1.1.2The symbol 'M' in CNC programming means that the workpiece must be finished by grinding
1.1.3
1.1.4CNC machines are being used in the i ndustry since the 1970's
1.1.5Air is used for pressure test ing vessels because it does not compress
1.1.6The programmer of a CNC machine can set the z ero point (W\ anywhere i n t he workpiece.
1.1.7You can use a pressure vessel without a gauge if it is newly constructed and already pressure tested.
1.1.8elding symbols are standard symbols used internationall y.
1.1.9
1.2Choose an option from COLUMN B that matches a description in COLUMN A. Write only the letter (A F\ next to the question number (1.2.1
1.2.5\ in the ANSWER BOOK. COLUMN A COLUMN B
1.2.5Scribing large arcs and circles CNC machine codes Mean diameter CNC lathes ne of the piping terms used for sides
Q2— Section header —
2.1Neatly draw a welding symbol representing a double V joi nt shown i FIGURE 1
2.2
2.3The operator must operate the pressure testing equipment according to the specifications. State THREE requirements that the pressure testing equipment must meet when testing pressure vessels. (3\
2.4particular sequence should be followed when using hydraulic and pneumatic leak tests. Briefly explain the sequence of
2.5It is important in marking to establish datum points and setting t points. Name FOUR types of datum
Q3— Section header —
3.1Define third angle orthographic projections, referring to the positioning of views. (3\
3.2FIGURE 2 shows a roof truss. Name any THREE members of the roof truss indicated. Write only the answer next to the letter
3.3State FIVE correct methods that you would apply when lifting and carrying hea y material when assembling steelwork. (5\
3.4When erecting a structure on site it is important to comply with the rules set out by the Occupational Health and Safety Act. State FIVE rules that must be
Q4— Section header —
4.1Write in full the following abbreviation s used in pipework fabrications:
4.1.1ISO
4.1.2P&ID
4.1.3WOG
4.1.3
4.2When you arrive at the work place the s upervisor took you through the j ob card and asked you
4.3spirit level is a tool used to indicate/measure how parallel (level\ or perpendicular (p lumb\ surface is. Indicate which tube vial (A, B or C\ shown in FIGURE 3 would be used for
4.3.3FIGURE 3
4.3.1True horizontal
4.3.2True vertical
4.3.3
4.4Calculate the offset of a pipe if the travel length is 1 500 mm and the advance is 250 mm. (4\ [16] 603101416
Q5— Section header —
5.1CNC machines can be used for many different purposes
5.1.1Can a CNC mach ine (1\
5.1.2Support your answer by giving ONE example or ONE reason (1
5.2Name EIGHT types of CNC cutting machines used in the industry. (8
5.3State the cost difference between conventio nal system and CNC system
5.4Answer the following questions with regard to FIGURE FIGURE 4
5.4.1State the maximum depth that this insert can cut. (1\
5.4.2State the feed rate range for this insert. (2\
5.4.3
5.5FIGURE 5 represents a CNC milling machine. FIGURE 5 To comply with the right hand rule for motion if your thumb is represented by 'X':
5.5.1Which fing ers will represent 'Z' and 'Y'? (2\
5.5.2Name ONE part of the milling machine that is shared by two co ordinates. (2
5.6Give THREE reasons why it is important to simulate the program. (3\
5.7State THREE factors to consider when deci ding how much material should be removed during machining.
5.8.1State the meaning of the F code.
5.8.2
5.9State FOUR causes of tool wear on the machine. (4\ [37] TOTAL SECTION B: GRAND TOTAL:37