Mechanotechnology N3 — Document
November 2022 — N3 — Mechanotechnology
N3
2022
Nated Engineering
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Q1— Section header —
1.1A wedge belt drive of a 55 kW electric motor runs at 1 200 r/min to a conveyor belt running at 750 distance is 2 000 mm over a duty of 11 hours per day. The shaft driving the motor has an 80 mm diameter and the shaft driving the conveyor is 90 mm. the
1.1.1Speed ratio (2\
1.1.2Service factor (2\
1.1.3Design Power (2\
1.1.4The minimum pulley diameter (2\
1.2When positioning an idler sprocket, there are factors to be considered. State SIX of these factors. (6\
1.3Name THREE categories of fast couplings. (3\
1.4Name THREE types of friction clutches. (3\ [20]20
Q2— Section header —
2.1FIGURE 1 below shows a sketch of a brake system. Name the brake system shown. (1\
2.2Name the parts indicated in the FIGURE 1 by writing only the answer next to the letter (A D\ in the ANSWER BOOK. FIGURE 1 (4\ [5] 81903735
Q3— Section header —
3.1FIGURE 2 below shows two anti friction bearings. Name the TWO anti friction bearings shown
3.2Name the parts indicated in FIGURE 2 by writing only the answer next to the letter (A D\ in the ANSWER BOOK FIGURE 2 (4\
3.3A bearing number consists of three figures. On each number, what does the first figure indicates? (1\
3.4Briefly explain the working principle of an anti friction bearing. (3\ [10]10
Q4— Section header —
4.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'T rue or 'F alse
4.1.6in the ANSWER BOOK.
4.1.1reciprocating pump has THREE main moving elements. (1\
4.1.2A plunger and a piston perform the same function. (1\
4.1.3piston in water pump has packing rings inserted on the rim in order to prevent water leakage. (1\
4.1.4Low pressure in piping system is the cause for water hammer. (1\
4.1.5If there is no vacuum in the pump system, then no suction of water can take place. (1\ 8190373
4.2.1Too much oil (2\
4.2.2Too little oil (2\
4.3Name TWO types of ir cooling systems. (2\
4.4State FOUR reasons for cooling a compressor. (4\ [15]15
Q5— Section header —
5.1State the main difference between a pneumatic system and a hydraulic system. (2\
5.2Make a rough sketch of the following pneumatics symbols:
5.2.1Pressure relief valve (2\
5.2.2Adjustable control valve (2\
5.3If the pressure in hydraulic system is 0,9 MPa and the diameter of the plunger is 250 mm alculate:
5.3.1The cross sectional area of the plunger (2\
5.3.2The force exerted by the plunger (2\ [10]10
Q6— Section header —
6.1State ONE function of a turbo in an engine (1\
6.2Name the FOUR different strokes of a petrol engine. (4\ [5] 81903735
Q7— Section header —
7.1Choose a term from COLUMN B that matches a description that causes a steel rope to deteriorate in COLUMN A. Write only the letter (A D\ next to the question number (7.1.1
7.1.4\n the ANSWER BOOK. COLUMN A COLUMN B
7.1.5Accelerated wear Strand break Corrosion Bird cage Reduction in diameter
7.2There are THREE forces acting on a jib of a wharf crane. Name these THREE forces. (3\ [8]8
Q8— Section header —
8.1Name FOUR properties of metal. (4\
8.2State THREE characteristics of thermoplastics. (3\ [7]7
Q9— Section header —
9.1Within the production process of an organization, the budget is managed through various documents. Name FOUR of these documents. (4\
9.2Briefly state FOUR limitations of downwards communication (4\
9.3Briefly discuss FOUR purposes of the Occupational Health and Safety Act (No. 15 of 1993\ (4\ [12]12
Q10— Section header —
10.1Explain the concept entrepreneurship (4\
10.2Name FOUR factors that will influence the location of a small business enterprise (4\ [8] TOTAL 1008
Topics Identified
2
Business FunctionsBusiness Plan
Mark Allocation
Total100 marks
Sections20 + 5 + 10 + 15 + 10 + 5 + 8 + 7 + 12 + 8 = 100 marks
Paper information
TitleDocument
SubjectMechanotechnology
LevelN3
Document typeQuestion paper
Year2022
MonthNovember
Pages9
Downloads3
Examination context
Decade2020s
Years ago4y
SeasonSpring (SH)
Start dayTuesday
Exam periodNovember 2022
Days since exam1,441
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