Fitting And Machining Theory N2 — Document
April 2019 — N2 — Fitting And Machining Theory
N2
2019
Nated Engineering
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Q1— Section header —
Q1— Section header —
Q2— Section header —
2.1Explain the function of a coupling. (2\
2.2State the groups into which the following couplings fall
2.2.1Raffard coupling
2.2.2Fluid drive coupling
2.2.3Universal coupling
2.2.46
Q3— Section header —
3.1List FOUR values of the ISO system of limits and fits. (4\
3.2coupling must have a shrink fit nto a shaft . The dimensions of the hole and shaft are as follows:
3.2.1he low er limit of the shaft
3.2.2he high er limit of the coupling
3.2.37
Q4— Section header —
4.1Name the TWO types of rolling contact that occur in rolling bearings. (2\
4.2FIGURE 1 below shows a diagram of a bearing. Identify the bearing loads labeled A, B and C. Write only the answer next to the LETTER (A C\ in the ANSWER BOOK. FIGURE 1
Q5— Section header —
5.1Name the THREE main types of lubricants. (3\
5.2State TWO functions of valves used in fluid power systems.
5.3Explain the function of a safety valve in a fluid system. [6]6
Q6— Section header —
6.1Describe in FIVE steps how to pack a stuffing box. (5\
6.2List FOUR disadvantages of plastic piping. (4\ [9] (11022032\9
Q7— Section header —
7.1Explain the operation of the plunger pump (4\
7.2State the type of displacement that occurs in this pump. (1\
7.3Give a reason for your
Q7— Section header —
Q8— Section header —
8.1Name TWO types of reciprocating piston compressors used in industry. (2\
8.2What is the purpose of an intercooler in multi stage centrifugal compressor (2\ [4] (11022032\4
Q9— Section header —
9.1FIGURE 3 below shows a cross sectional view of a V belt. Name the parts
9.2List THREE safety precautions to be taken when working with gear drives. (3\
9.3State THREE advantages of chain drives over gear drives. (3\
9.4Give a reason for the use of double reduction gearing when requiring the following:
9.4.1A high output speed
9.4.2
9.5What is the name given to the gear fitted to the output shaft of the gearbox? (1\ [12] TOTAL SECTION 60 (11022032\12
Q10— Section header —
10.1Explain how the hydraulic fluid is used to perform the follow ing functions in a hydraulic system
10.1.1Power transmission
10.1.2Lubrication
10.1.3
10.2Identify the ISO hydraulic symbols below. Write only the answer next to the question number (10.2.1
10.2.5\the ANSWER BOOK.
10.2.5
10.3Explain the functions of each of the following hydraulic components:
10.3.1Pressure relief valve
10.3.2
10.4Name the TWO most important factors in the functioning of a pneumatic system. (2\ (11022032\ 700
10.5Make neat, freehand sketches of the ISO symbols representing the following pneumatic components
10.5.1Compressor
10.5.2Air receiver
10.5.3
10.6State the main difference between a hydraulic system and a pneumatic system (2\ 10. List the THREE checks to be done on hoses when maintaining a pneumatic
Q11— Section header —
11.1State the function of a lathe mandrel. (1\
11.2State TWO causes of a long slender shaft bending when not using a lathe steady. (2\
11.3State TWO ways of cutting a taper on the lathe. (2\
11.4A circular shaft with an outside diameter of 85 mm must be machined with a two start square thread of 12 mm pitch
11.4.1The lead of the thread (1\
11.4.2The mean diameter of the thread (2\
11.4.3The helix angle of the thread (2\
11.5The cutting speed for a cast iron bar of 65 mm diameter is 22 m/min. Calculate the rotational speed of the spindle in revo lutions per minute. (3\
11.6A shaft with a length of 600 mm and a diameter of 90 mm is to be machined on a lathe. The cutting speed is 36 m/min and the machine feed is set at 0,75 mm/revolution. Calculate the time required for the machining process in minutes and
11.7Name the TWO types of programming applicable to CNC lathes. (2\ [20] (11022032\ 10 70020
Q12— Section header —
12.1FIGURE 4 shows pictures of milling cutters. Name the milling cutters writing only the answer next to the letter (A E\ the ANSWER BOOK. FIGURE 4
12.2A milling machine is used to cut 12 evenly spaced grooves around a shaft. Calculate the required indexing using a Cincinnati dividing head. NB: Use only side 2 on this index plate. THE CINCINNATI DIVIDING HEAD INDEX PLATE
12.3A 60 mm diameter cutter with 12 teeth and a cutting speed of 35 m/min has a feed of 0,09 per tooth. Calculate the feed in mm/min. (5\ (11022032\ 11
12.4FIGURE shows a diagram of a machine. FIGURE 4
12.4.1Name the machine shown in FIGURE (1\
12.4.2Identify the parts labelled A to D. Write only the answer next to the letter (A \the ANSWER BOOK.
Topics Identified
1
Business Plan
Mark Allocation
Total100 marks
Sections6 + 7 + 5 + 6 + 9 + 6 + 4 + 12 + 20 = 75 marks
Paper information
TitleDocument
SubjectFitting And Machining Theory
LevelN2
Document typeQuestion paper
Year2019
MonthApril
Pages12
Downloads3
Examination context
Decade2010s
Years ago7y
SeasonAutumn (SH)
Start dayMonday
Exam periodApril 2019
Days since exam2,751
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