Electrotechnics N4 — Memo

August 2019 — N4 — Electrotechnics

N4 2019 Nated Engineering

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Q1— Section header —

Q2— Section header —

2.1tates that the algebraic sum of the voltage drop in any closed circuit is equal to the algebraic sum of the applied

2.2The heat treatment and mechanical handling to which the specimen has been subjected. (2\

2.3.1An EMF is induced in an electric circuit whenever there is a change in the magnetic flux linking with that circuit. The magnitude of the induced EMF is directly proportional to the rate of change of the

2.3.2The direction of an induced EMF is always such that it tends to set up a current opposing the motion or the ch ange of flux responsible for inducing that EMF. (2\

2.4

2.4.1EBlv 0,1530105 xxx 0,225 FBlI 0,15301040010 xxxx 180,018 mHN

2.5(5\ [18

Q3— Section header —

3.1.1By the movement of a conductor in a magnetic field

3.1.2

3.2Graphite brushes Electrographite brushes Series connected

3.5GIVEN: Aluminium (Al\: Length (l\ = 3 km Current (I\ ? Diameter (d\ = 2 mm Copper (Cu\: Length (l\ = 3 km Current (I\ = 50 A Diameter (d\ = ?

3.5.1TAlCu III 20050 0,002103104 210 xxxx xx 2,674 1502,674401,1

3.5.2401,1 TAlCu VVVV [18]18

Q4— Section header —

4.1The field coils may be connected incorrectly. Brushes may be jammed in their holders. The brushes or the commutator may be dirty. There may be an open or short circuited field circuit. There may be loose brush connections.

Q5— Section header —

5.1They have no moving parts and their operation is silent. they have no rotating parts or bearings, they require little care and maintenance. (3\

5.2The windings The oil tanks The protection device Automatic washing machines Im = 25 mA = 0,025 A

5.5.1As a mmeter: I = 20 A mmm VIxR 0,02510 0,25 TMSH III

5.5.2As v oltmeter: V = 110 V TMSer VVV 1100,25 Ser 109,75 Ser

Q6— Section header —

6.118

Mark Allocation

Sections18 + 18 + 18 + 18 = 72 marks

Paper information

TitleMemo

SubjectElectrotechnics

LevelN4

Document typeNated Engineering

Year2019

MonthAugust

Pages7

Downloads4

Examination context

Decade2010s

Years ago7y

SeasonWinter (SH)

Start dayThursday

Exam periodAugust 2019

Days since exam2,628

About Electrotechnics 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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