Engineering Science N3 — Document
April 2019 — N3 — Engineering Science
N3
2019
Nated Engineering
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5.3The formula used or the manipulation thereof Substitution of the given data in the formula The answer with the correct SI unit 6. 7. 8. 9. 10. 11.
Q1— Section header —
1.1Distinguish between elastic collision and inelastic collision (2\
1.2Two completely elastic balls of 2 kg and 5 kg respectively move in the same straight line but in opposite directions and collide. Before the collision the 2 kg ball
1.3In FIGURE 1 a graph is shown that represent the motion of a train at rest. 20
1.3.1The acceleration of the train during the first 30 econds. (2\
1.3.2The total distance the train has travelled after 60 seconds. (3\
1.4The driver pulley of a diesel motor has a diameter of 6 cm and rotates at 300 r/min The flat belt has a thickness of 5 mm. The tension in the tight side is 1 400
1.4.1The tension in the slack side
1.4.2The belt velocity in m/s
1.4.316
Q2— Section header —
2.1Define the moment of a force (2\
2.2FIGURE 2 shows the shear force diagram of a light horizontal beam ABCDE with uniform cross section. All the values of the loads are in kN.
2.2.1At which TWO positions is the beam supported and what is the magnitude of each support (2\
2.2.2Calculate the magnitude of the distributed loads between AB and CD (4\
2.2.3Draw the light horizontal beam ABCDE indicating ALL value loads and supports at the CORRECT positions (4\
Q3— Section header —
3.1Distinguish between the equilibrant and the resultant force (2\
3.2Two ropes support a mass with a weight of 500 N as shown in FIGURE 3. 45 30 45
3.3Name TWO conditions for STATIC equilibrium if the forces acting on the framework or object are in equilibrium. (2\
3.4Determine the magnitude and nature of the forces in members AB and BC in the structure shown in FIGURE 4. (4\ 25
Q4— Section header —
4.1State THREE advantages of friction as applicable to engineering. (3\
4.2A body with a mass of 80 kg is sliding at a constant velocity down an incline without any external force acting on it. The angle of inclination is 30 Calculate the fol lowing:
4.2.1The weight component perpendicular to the sliding plane (2\
4.2.2The weight component parallel to the sliding plane (2\
4.2.3The friction force (1\
4.2.4The coefficient of friction of the plane (2\
4.2.5The external force required to pull the body up the plane at constant velocity (2\ [12]12
Q5— Section header —
5.1Explain what is meant by the specific heat capacity of a substance (1\
5.2The following data refer to a copper rod , 4 m in length, being heated through burning coal: Initial temperature of the rod Amount of coal burned Percentage of heat transferred to the rod Mass of the rod
5.2.1The heat energy transferred to the rod (2\
5.2.2The final temperature of the rod (2\
5.2.3The final length of the rod (3\
5.3Describe the effect of the change in pressure on the saturation temperature of a substance (1\
5.4The total enthalpy of 1 kg of wet steam at a pressure of 900 kPa is 2 600 kJ. Calculate the dryness factor of the steam (2\ (15070413\
5.5A mild steel bar with dimensions of 200 cm 120 mm is heated from 15 C to 70 C and the area increases to 0,2430314 m
Q6— Section header —
6.1Name TWO types of pressure readings which can be taken on a liquid. (2\
6.2A hydraulic press has a plunger diameter of 25 mm. The force acting on the plunger is 70 N while the ram has a diameter of 12 cm. Calculate the following
6.2.1Mass in kg that can be raised (4\
6.2.2Pressure in the liquid (3\
6.2.3Distance that the ram piston will rise after 20 strokes if the plunger stroke is 80 mm (3\ [12]12
Q7— Section header —
7.1What is meant by the EMF of a cell (1\
7.2and that across the unknown resistor is 10 V. Calculate the following
7.2.1Current through the resistors
7.2.2Resistance of the unknown resistor (2 2\ (4\ (15070413\
7.3A current of 8 A flows through a silver nitrate solution for 2 hours in order to electroplate an object. The electrochemical equivalent for silver is 0,001118 g/C. Calculate the following:
7.3.1Amount of electric charge required
7.3.2Mass of silver deposited (2 2\ (4\
7.4A single phase transformer has a supply voltage of 220 V and a primary current of 3 A at full load. The secondary current is 0,2 A and there are 300 turns on the primary coil. Calculate the following
7.4.1Turns ratio
7.4.2Number of turns in the secondary (2 2\ (4\ [13]13
Q8— Section header —
8.1What is an ion (1\
8.2State THREE different types of corrosion (3\
8.3State TWO properties of brass (2\ [6] TOTAL: 100 (15070413\6
Mark Allocation
Total100 marks
Sections16 + 12 + 14 + 12 + 15 + 12 + 13 + 6 = 100 marks
Paper information
TitleDocument
SubjectEngineering Science
LevelN3
Document typeQuestion paper
Year2019
MonthApril
Pages12
Downloads6
Examination context
Decade2010s
Years ago7y
SeasonAutumn (SH)
Start dayMonday
Exam periodApril 2019
Days since exam2,750
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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