Mechanotechnology N3 — Document
April 2019 — N3 — Mechanotechnology
N3
2019
Nated Engineering
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Q1— Section header —
1.1A car wash machine, rotating at 800 r/min, is driven by a 38 kW electric motor with a rotational speed of 1200 r/min. It operates at medium duty for only eleven hours per day and a sof
1.1.1Calculate the speed ratio (1\
1.1.2Determine the service factor (1\
1.1.3Calculate the design power (2\
1.1.4Determine the minimum pulley diameter (1\
1.1.5Calculate the number of belts if the corrected power per belt is 22 kW. (2\
1.2State THREE factors to consider before deciding to apply a transmission of gear drives.
1.3Study FIGURE 1 below which show coupling and answer the
1.3.1Name the type of coupling. (1\
1.3.2Label parts by rit ing the answer next to the letter (A
1.4Briefly describe the purpose of a clutch. (2\
1.5State THREE advantages of operating a loose weight centrifugal clutch. (3\ [20 8190373
Q2— Section header —
Q3— Section header —
3.1Distinguish between friction bearings and anti friction bearings (2
3.2Anti friction bearing s must be free of contamination and must be monitored regularly. State THREE methods to determine the condition of a bearing during service (3\
3.3Indicate whether the following statement is TRUE or FALSE. Write only 'True' or 'False' next to the question number (3.3.1.\the ANSWER BOOK.
3.3.1Each bearing has an identification number consist ing of three figures, the third figure refers to its diameter series. (1\
Q4— Section header —
4.1If you experience a problem with a centrifugal pump, it will usually be at the suction side of the pump Briefly explain how can you overcome this problems (2\
4.2Exp lain the function of a pet cock in a centrifugal pump. (2\
4.3Name ONE purpose of a mechanical seal in water pumps. (1\
4.4State FOUR advantages of an impeller assisted cooling system over thermosyphon cooling system. (4\
4.5Discuss the working principle of a heat exchanger as a water cooling system. (3\ 8190373
4.6FIGURE 2 show s a splash lubrication set up FIGURE 2 Label the marke parts
Q5— Section header —
5.1State T HREE functions of a hydraulic accumulator. (3\
5.2Draw a neat symbol of a hydraulic accumulator (1 5. A hydraulic cylinder has a volume of 620
5.3.1 Cross sectional area of the cylinder if the length of the cylinder is 120 mm
5.3.2 iameter of the cylinder
5.3.3 ressure in the cylinder if the exerted force is 40 (3 2\ (6\
Q6— Section header —
6.5\ in the ANSWER BOOK.
6.1The two phases of t he two stroke petrol engine cycle is called the induction phase and the
6.2A turbo is suitable only for a petrol engine.
6.3blower is driven by an engine us ing a belt drive.
6.4A diesel engine is more expensive to maintain than other engines
6.5The power output of a diesel engine is generally lower than that of a petrol engine. (5 1\ [5]5
Q7— Section header —
7.1State FIVE disadvantages of a climbing type tower crane. (5\
7.2State THREE functions of a fibre core in a steel rope. (3\ [8]8
Q8— Section header —
8.1Discuss the process of heat treatment on metal. (2
8.2Name the colour coding for each of the following metals
8.2.1Silicon chrome steel (1\
8.2.2Cast steel (1\ 8. 3. Briefly describe , in point form, the general behavio r of copper during
Q9— Section header —
9.1Define grievance. (2\
9.2State FOUR aim s of the Occupational Health and Safety Act No. 85 of 1993. (4\
9.3Name FOUR types of disciplinary actions that can be taken by the employer against a employee who committed an offence. (4\ [10]10
Q10— Section header —
10.1Explain the term small business enterprise (4\
10.2What is the ultimate objective of an entrepreneur (1\
10.3State S IX qualities of an entrepreneur. [1
1.05Speed atio Pitch diameter of pulleys Power per belt kW BELT LENGTH Driver
Topics Identified
1
Business Plan
Mark Allocation
Total100 marks
Sections5 + 8 + 8 + 10 = 31 marks
Paper information
TitleDocument
SubjectMechanotechnology
LevelN3
Document typeQuestion paper
Year2019
MonthApril
Pages12
Downloads3
Examination context
Decade2010s
Years ago7y
SeasonAutumn (SH)
Start dayMonday
Exam periodApril 2019
Days since exam2,750
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