Electrotechnics N5 — Memo

November 2023 — N5 — Electrotechnics

N5 2023 Nated Engineering

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Q1— Section header —

1.1Armature eaction is the distortion of the pole flux due to armature flux. Armature reaction is the distortion of the main field due to the interaction between the two fields ( the main field flux and the flux around the armature

1.2.1

1.3= 26 667 A sh = 26 667 + = 26 667 + = 26 667 + 1

1.4Commutation 510 V And E = erefore N =

Q2— Section header —

2.1.1= 10,609 = 15

2.1.2Power actor = cos 68,97 = 0,359 lagging (2\

2.1.3= 29,697 (2\

2.1.4= 10,657 + j27,7129 = 27,719 (2\

2.1.564 = 100 (2\

2.3Using capacitor banks in parallel with the supply Using synchronous motors instead of induction motors The resultant current drawn from the supply (I\ is at its minimum The resultant current (I\ will be in phase with the voltage (unity power

Q3— Section header —

3.1Useful flux is the flux that links the two windings and has its path through the iron core while leakage flux is the magnetic flux produced by the primary winding that neither link to the secondary winding nor has its path through the

3.2Resistance referred to secondary: 0,6 + 9 0,6 + 0,2975 0,898

3.3Taking the 1 400 kVA transformer as the base: (2%\ 2,8%

34.35= 0, 826 agging 000 31,79 = 1078

29.58f = 869 agging

3.4B.f Eddy current loss is proportional to the square of flux density, the sq of frequency and the square of thickness of laminations. Eddy current loss ; therefore, the higher the frequency

Q4— Section header —

4.2rms = 2,22 P = three pairs =

4.3

Q5— Section header —

5.1

Mark Allocation

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleMemo

SubjectElectrotechnics

LevelN5

Document typeNated Engineering

Year2023

MonthNovember

Pages10

Downloads5

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,077

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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