Mechanotechnics N5 — Document

August 2018 — N5 — Mechanotechnics

N5 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 34 items found

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Q1— Section header —

1.1A locomotive has a mass of 100 ton, 70% of which is supported by the driving wheels. The coefficient of adhesion friction between the wheels and the rails is 0,3 and the rolling resistance is 80 N/ton of the

1.1.1The tractive effort of the locomotive (3\

1.1.2The total rolling resistance of the locomotive and the trucks (3\

1.1.3The tractive effort of the locomotive required to haul the trucks on a level tr ck at a constant speed (1\

1.1.4The tractive effort of the locomotive required to haul the truck up an incline f 1 in 90 at constant speed (3\

1.1.5The acceleration required to accelerate the locomotive and the truck up the incline (3\

1.1.6The braking force required by the locomotive if only the locomotive is supplied with brakes, to decelerate the locomotive and the trucks in 3 minutes fr om 43,3 km/h to 32,4 km/h down the incline of

Q2— Section header —

2.1Calculate the torque required to increase the speed of flywheel with a mass of 1 400 kg and radius of gyration of 820 mm from 100 r/min to 130 r/min in 35 seconds. (8\

2.2A flywheel has a mass of 600 kg and a radius gyration of 830 mm. Calculate the following:

2.2.1The kinetic energy required to give the flywheel a speed of 95 r/min from rest (2\

2.2.2The uniform torque required to accelerate the flywheel from 48r/min to 108 r/min (2\

2.2.3The time required for this acceleration (3\ [15] (8190225\ T1110(15

Q3— Section header —

3.1State FOUR advantages of employing suspended electromagnet device to remove scrap iron from conveyor belt transporting non metal load

3.2The coefficient of friction between driving pulley and flat belt is 0,25 and the belt width is 120 mm. The diameter of the driving pulley is 700 mm and its

3.2.1The speed of the belt (2\

3.2.2The mass of the belt (2\

3.2.3The centrifugal force (2\

3.2.4Tension on both sides taking centrifugal force into account (6\

3.2.5The output power transmitted by the driver (2\ [18]18

Q4— Section header —

4.1The diameter of the head pulley (6\

4.2The total length of the chain Assume the same diameter for both head and tail pulleys. gnore the deflection of the chain given by the tensioning device. (2\

4.3The driving motor power required if the drive is 75% efficient (10\ [18] (8190225\ T1110(18

Q5— Section header —

5.1The total number of tubs required (4\

5.2The mass in conveyance (5\

5.3The motor power (7\ [16]16

Q6— Section header —

6.1Calculate the speed of haft C and its direction of rotation. (9\

6.2Determine the speed and direction of rotation of haft C if gear wheel D is free and rotating at 100 r/min in the same direction as arm B. (3\

6.3Determine the br aking torqu e required to hold the shaft of gear wheel D stationery when all frictional losses are neglected. The gear train transmits 7,5 kW. (4\

Mark Allocation

Total100 marks

Sections17 + 15 + 18 + 18 + 16 + 16 = 100 marks

Paper information

TitleDocument

SubjectMechanotechnics

LevelN5

Document typeQuestion paper

Year2018

MonthAugust

Pages8

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,994

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

identifying revision priorities

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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