Fitting And Machining Theory N2 — Document

August 2018 — N2 — Fitting And Machining Theory

N2 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 10 pages 📝 82 items found 📚 1 topics

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Q1— Section header —

1.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number (1.1.1

1.1.5\ the ANSWER BOOK.

1.1.1A fixed mach ine guard only moves with each operation of the machine

1.1.2openings in the floor, pits and trap holes is an important precaution to take to prevent accidents to persons.

1.1.3ompressed gas cylinders containing oxygen must be stored away from flammable products.

1.1.4It is not necessary to be trained and authorised in order to operate mechanical handling equipment.

1.1.55

1.2Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number (1.2.1

1.2.5\ the ANSWER BOOK.

1.2.1Calcium carbide taken into a mine may be left underground for use by the employees of the next shift.

1.2.2Any flame cutting, welding or flame heating to be performed underground, must be ap proved by the mine manager , before the

1.2.3Smoking is only allowed in the 'old workings' of a mine.

1.2.4It is not necessary to illuminate places where moving machinery is erected.

1.2.55

Q2— Section header —

2.1Name the THREE types of coupling misalignment. (3\

2.2FIGURE 1 shows the diagram of a coupling FIGURE 1

2.2.1Name the coupling shown in FIGURE 1.

2.2.2Which group does this coupling belong to?

2.2.36

Q3— Section header —

3.1The ISO system of limits and fits provi des standards for the universal use in selecting shaft or hole tolerances. List FOUR values of the ISO system of limits and fits. (4\

3.2Briefly describe the interchangeability of parts. (2 [6]6

Q4— Section header —

4.1Explain the following erm with regard to the properties of bearing

4.1.1Compatibility

4.1.2Conformability

4.1

4.25

5.1Name THREE lubricating devices associated with the gravity feed principle. (3\

5.2Define the term burning point (1\

5.3State TWO functions of valves used in fluid power systems. (2\ [6]6

Q6— Section header —

6.1State TWO functions of packing and seals. (2\

6.2State THREE properties of white metal used for packing and seals. (3\

6.3Name FOUR types of material used to seal threaded pipes. (4\ [9] QUESTION 7: PUMPS9

7.1State the function of a pump. (1\

7.2FIGURE 2 shows the diagram of a gear pump FIGURE 2

7.2.1Name the parts labelled A in FIGURE 2 . Write only the answer next to the letter (A

7.2.2Name the category under which this pump is classified. (1\ [6] 110220326

Q8— Section header —

8.1State the main function of a compressor. (1\

8.2Explain the operation of a lobe compressor.

8.3Name the TWO categories of air compressors. (2\

Q9— Section header —

9.1State the causes of the following V belt problems

9.1.1Small cracks

9.1.2Swelling

9.1.3

9.2Name the TW O gear profiles in relation to gear drives. (2\

9.3Name THREE types of chains used in industry. (3\

9.4State TWO purposes of reduction gearboxes [1

Q10— Section header —

10.1Tabulate THREE differences between hydraulic system and pneumatic

10.2Make neat, freehand sketches of the ISO symbols representing the following hydraulic or pneumatic components:

10.2.1Hydraulic pump

10.2.2Reservoir

10.2.3Compressor

10.2.4Electric motor

10.2.5

10.3List any FOUR steps that can be followed during the daily maintenance of a pneumatic system. (4\

10.4List FIVE advantages of pneumatic systems. (5 [20] 1102203220

Q11— Section header —

11.1State TWO functions of lathe steadies (2\

11.2One method of setting over the tailstock to cut tapers is the graduated sleeve method.

11.2.1State TWO advantages of the graduated sleeve method of setting over the tailstock (2\

11.2.2State TWO disadvantages of the graduated sleeve method of setting over the tailstock (2\ 11. The statements below are brief explanations of the TWO types of programming used on the CNC lathes. State the type of prog

11.5It takes 8 minutes to take one longitudinal cut along a workpiece with a length of 350 mm on a centre lathe. Determine the feed of the cutting tool in m m per revolution if the spindle rotates at 110 r/min.

Q12— Section header —

12.1FIGURE shows the diagram of the four milling cutters FIGURE

12.1.1Name the four milling cutters shown in FIGURE . Write only the answer next to the letter (A D\ in the ANSWER BOOK.

12.1.2State ONE use for ea ch of the milling cutters shown in FIGURE 5

12.2

12.3Explain the following milling terms:

12.3.1Indexing

12.3.2

12.4Name the TWO types of work tables used on urface grinding machine (2\

12.5Give THREE reasons why a workpiece ould be scratched when performing surface grinding. (3\

Topics Identified

Business Plan

Mark Allocation

Total100 marks

Sections5 + 5 + 6 + 6 + 5 + 6 + 9 + 6 + 20 + 20 + 20 = 108 marks

Paper information

TitleDocument

SubjectFitting And Machining Theory

LevelN2

Document typeQuestion paper

Year2018

MonthAugust

Pages11

Downloads2

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,995

About Fitting And Machining Theory examination preparation

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