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Q1— Section header —
1.1Boiler makers use templates t o develop patterns and mark off structural steel sections.
1.1.1State THREE advantages of using a template (3\
1.1.2Nam e TWO development methods th at can be used to mak templ ates (2\
1.2Choose a description from COLUMN B that matches a term in COLU MN A. Write only the letter (A next the question number (1.2.1
1.2.3in the ANSWER BOOK COLUMN A COLUMN B
1.2.3Scale up or enlargement scale xternal templates Wood or hard board
1.3Show by means of TWO neat separate drawings how the scales below are used in real life s
1.3.1Reduction scale
1.3.2Enlargement scale [15] (6031002\15
Q2— Section header —
2.1State the function of each of the hand tools used by boiler makers during the marking off and laying out process
2.1.1Bevel gauge (1\
2.1.2Trammels (2\
2.1.3Chalk line (2\
2.2Compare the following tools by completing the table below. Write only the answer nex t to the question number (2.2.1
2.2.4\the ANSWER BOOK. Centre punch Prick punch Included angle
2.2.2Tool function
2.2.4(4 1\ (4\
2.3Calculate the length of a 12 mm thick plate required to make a cylinder with an inside diameter of 944 mm. 6\ [15]15
Q3— Section header —
3.1Explain each of the following material properties which play an important role the forming and shaping process
3.1.1ardness
3.1.2alleabilit
3.1.3Ductility (3 1\ (3
3.2Compare ductility and malleability (2 2\ (4
3.3Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only rue or '
3.4Calculate the area of 20 mm thick plate required to make a cy linder with a height of 850 mm and an outside diameter of 280 mm (6
Q4— Section header —
4.1The oxy acetylene cutting process is mostly used by boiler makers to cut thick materials. State THREE types of flames that are involved during the flame setting process. (3\
4.2Complete the sentence by writing the missing w ord next to the question number (4.2\the ANSWER BOOK. is caused by an in balanced setting of gases. (1\
4.3State TWO main functions of a gas re gu lator. (2\
4.4Show the following defects by making a neat sketch of each
4.4.1Rounded top corners
4.4.2
4.5Make a neat sketch of a neutral fl ame. (2\
4.6Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only True' or ' False' next to the question number (4.6.1
4.6.3\ the ANSWER BOOK.
4.6.1A n eutral flame has unequal quantities of oxygen and acetylene.
4.6.2Unequal quantities of oxygen and acetylene result from backfiring.
4.6.315
Q5— Section header —
5.1Study the following statements and arrange them according to the TWO groups in QUESTIONS
5.1.1and 5.1.2. Write only the relevant letters (A G\ next to the question number
5.1.2in the ANSWERBOOK.
5.1.1Requirements for blade selection (4\
5.1.2Advantages of using coolant (3\
5.2Show by means of a neat sketch how a power saw is used to cut materials. HINT A p ower saw uses reciprocating action.
5.3Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only rue ' or ' alse