Mechanotechnics N5 — Document

November 2020 — N5 — Mechanotechnics

N5 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 31 items found

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Q1— Section header —

1.1Determine the speed of the gearwheel A if arm E is stationery. (8\

1.2Determine the speed of arm E if gearwheel A is fixed. (4\ [12] QUEST ION 212

2.1List FOUR functions of reduction gearbox. (4\

2.2FIGURE 2 below shows a reduction gearbox with a two start worm, a worm gear and four gears. The worm shaft is connected to an electric motor rotating at 1 200 r/min. A=120 teeth

2.2.1The speed of the worm gear. (5\

2.2.2The delivery speed of the gearbox. (3\

2.2.3The velocity ratio of the gearb ox. (3\ [15]15

Q3— Section header —

3.1Conveyor belts are equipped with holdback devices. Name THREE common types holdback devices used to stop the conveyor from reversing. (3\

3.2A vertical flat belt is required to transmit 175 kW at a speed of 050 r/min. he pulley has a diameter of 500 mm the coefficient of friction between the belt and the pulley is 0,3 and the angle of contact is 170

3.2.1The effective tension between pulleys. (3\

3.2.2The tension on the slack side (T \nd the tight side (T

3.2.3The load on the bearings of the belt. (3\

3.2.4The motor power if the efficiency of the drive is 80%. (3\ [18] Worm A=26 teeth B=46 teeth C=22 teeth D=74 teeth E=32 teeth18

Q4— Section header —

Q5— Section header —

5.1A locomotive haul a truck at 7 5 km/h when exerting a steady pull of 850 N on draw bar. Neglect the rolling resistance between the wheels and the rails. Calculate the following:

5.1.1The work done in 15 minutes. (4\

5.1.2The power required. (2\

5.2An electric locomo tive with a total mass of 260 ton is accelerating at 0,06 m/s up an incline of 1 in 120. The rolling resistance is 0,8% of the mass of the train. Calculate the following:

5.2.1The tractive effort to overcome frictional resistance. (2\

5.2.2he tractive effort to overcome gravity. (2\

5.2.3The tractive effort to accelerate the train. (2\

5.2.4The power required at a speed of 72 km/h. (4\

5.2.5The kinetic energy of the locomotive at 72 km/h. (2\ [18] 819022518

Q6— Section header —

6.1State TWO main differences in the construction of the goods elevator and a passenger elevator. (4\

6.2The loaded cage of goods hoist has a mass of 1 500 kg. The rope passes over a drum at the top of the shaft and to balance of 6 00 kg. The cage and balance mass move in guides and friction force at each guide is 600 N. The

6.2.1The motor power required to drive the maximum acceleration. (8\

6.2.2The rope tensions during deceleration if the maximum velocity is m/s and deceleration is at a uniform rate from maximum velocity to rest over the last 4 m of travel. (6\ [18] TOTAL: 10018

Mark Allocation

Total100 marks

Sections12 + 15 + 18 + 19 + 18 + 18 = 100 marks

Paper information

TitleDocument

SubjectMechanotechnics

LevelN5

Document typeQuestion paper

Year2020

MonthNovember

Pages9

Downloads3

Examination context

Decade2020s

Years ago6y

SeasonSpring (SH)

Start daySunday

Exam periodNovember 2020

Days since exam2,169

About Mechanotechnics examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

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A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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