Engineering Science N3 — Document
April 2020 — N3 — Engineering Science
N3
2020
Nated Engineering
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Q1— Section header —
1.1Defi acceleration (1\
1.2The diagram in FIGURE represent the motion of a train. V(m/s\ 20 50 t(s\ FIGURE 1
1.2.1cceleration of the train during the first 20 econds (2\
1.2.2otal distance the train has travelled after 50 econds (3\
1.3
1.3.1ngle in radians (1\
1.3.2(2\
1.3.3ork done (2\
1.4A flat belt fits around a pulley with a diameter of 38 The belt has a speed of 18,7 m/s and transmits 5 N per mm belt width. The effective pull in the belt is 420 N and the belt width is 21 cm. Calculate
1.4.1ower transmitted by the belt in kW (2\
1.4.2ight side force in the belt (1\
1.4.3ulley speed in r/s (2\ [16]16
Q2— Section header —
2.1Define torque (2\
2.2FIGURE show simply supported loaded beam. kN kN/m kN 25 FIGURE 2
2.2.1Calculate the magnitude of the reactions of supports B and C (4\
2.2.2Draw a shea force diagram of the beam to suitable scale and ndicate all the main values on the diagram. (6\ [12]12
Q3— Section header —
3.1Define parallelogram of forces (2\
3.2Determine the magnitude of the unknown forces show n in the system of forces in FIGURE 3 50 N FIGURE 3 (6\
3.3Name TWO conditions for static equilibrium if the forces acting on the framework or object are in equilibrium. (2\
3.4FIGURE 4 below shows a structure. Determine the magnitude and nature of the forces in members AB and BC. 47,5 kN 52,5 FIGURE 4 (4\ [14]14
Q4— Section header —
4.1State THREE principles of kinetic friction. (3\
4.2
4.2.1omponent of the weight of the object perpendicular to the surface (2\
4.2.2omponent of the weight of the object parallel to the surface (2\
4.2.3riction force between the casting and the incline (3\
4.2.4mallest force required to move the casting down the incline (2\ [12]12
Q5— Section header —
5.1Name THREE factors on which the increase in length depends a metal rod is heated uniformly along its length.
5.2
5.2.1e in temperature of the aluminium strip (1\
5.2.2hange in length in mm of the aluminium strip (3\
5.2.3hange in area of the aluminium strip in m (3\
5.3Describe th e effect of the change in pressure on the saturation temperature of a substance. (1\
5.4Calculate the total enthalpy in MJ required to produce 2 kg of wet steam with a dryness fraction of 0,9 at a pressure of 1450 kPa. (4\ [15]15
Q6— Section header —
6.1Write an equation of delivery head in terms of suction head and static head. (2\
6.2The fo llowing data refers to a single stroke pump driven by a diesel engine, which has to deliver water to a reservoir above the pump Working pressure 0,45 MPa
6.2.1aximum height of the reservoir above the pump (3\
6.2.2ork done by the pump per second (4\
6.2.3utput power of the pump (1\
6.2.4fficiency of the pump (2\ [12]12
Q7— Section header —
7.1Explain potential difference of a cell (1\
7.2an unknown resistor. When the circuit is closed, the potential difference across the 5 6 V and that ac ross the unknown resis tor is 11, 4 V. Calculate
7.3A current of 10 A flows through a silver nitrate solution for hour to electroplate an object. The electrochemical equivalent for silver is 0,001118 g/C. Calculate each of the following
7.3.1mount of electric charge required
7.3.2
7.4A single phase transformer has a supply voltage of 230 V and a primary current of 6 A at full load. The secondary current is 0,4 A and there are 600 turns on the primary coil. Calculate each of the following
7.4.1urns ratio
7.4.213
Q8— Section header —
8.1Give the number of valence electrons for alkali earth metals (1\
8.2Name the TWO main groups into which elements in the periodic table are divided (2\
8.3Name ONE pr operty of brass. (1\
8.4Give the chemical formulae for limestone and hydrochloric acid. (2\ [6] TOTAL:6
Multiple Choice Options
1A)..
Mark Allocation
Total100 marks
Sections16 + 12 + 14 + 12 + 15 + 12 + 13 + 6 = 100 marks
Paper information
TitleDocument
SubjectEngineering Science
LevelN3
Document typeQuestion paper
Year2020
MonthApril
Pages11
Downloads3
Examination context
Decade2020s
Years ago6y
SeasonAutumn (SH)
Start dayWednesday
Exam periodApril 2020
Days since exam2,383
About Engineering Science examination preparation
Engineering Science combines physics principles with engineering applications. The examination covers mechanics, thermodynamics, electricity, and materials science at the relevant N-level.
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.
applying physics principles
selecting appropriate formulae
performing calculations with units
interpreting engineering scenarios
explaining scientific reasoning
A practical revision approach
Create a formula sheet organised by topic. The memorandum rewards correct formula identification, proper substitution, and accurate unit handling — always write the formula before substituting values.
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File size457 KB
Pages11
Archived on8 September 2026
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