Electrotechnics N4 — Memo

August 2018 — N4 — Electrotechnics

N4 2018 Nated Engineering

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Q1— Section header —

1.1structure

1.2magneto motive

1.3anti clockwise

1.4short shunt

1.5alternator

1.7eluctance

1.8ring motor

1.9Power stations

1.10Multipliers (10 [10]10

Q2— Section header —

2.1100(0,5\ PIR xR (0,5\(400\200 VIR 25020050 0,2 10001000 0,50,20,7

2.26,4 0,017 IA 6,416 0,4 VIR 62 (0,0171074\ 0,4

2.30,004 0,004 001 2002 (1\ (1\ Rt RRt 1281(0,004\(22\

2.43,0769 CxC CC 903,0769276,92 276,92 TTT QVCx QQQC QVC

Q3— Section header —

3.1Generator Solar nergy Thermocouple F = BIL = (0,7\(0,5\(15\ = 5,25 N P = IV = IE = 0,5 126 = 63 W

3.4In oop ABEFA: 112 28200,50,2(\ 80,70,2................................. .......(1\ EIR III In

Q4— Section header —

4.1If the field coils are connected incorrectly, the current induced by the residual magnetism will flow through the field coils in the opposite direction. This will result in the field strength of the pole cores being

4.20,67 VV PkW 22,7 2,7 22,72,720 aLf III 1,5(1,5\(20\30

4.32(4\ 2(2\(2\4 0,025 ppoles cp ZpN (2\(0,025\(540\(2\ (60\(4\ 1804/

Q5— Section header —

5.1fHz sin2(\ 180311sin2(50\(\ eEft sin(\2(50\ 0,00196sec1,96sec (3\

5.275sin(\ ewt 75sin(30\7530 64,95237,5 98sin(\ ewt 98sin(45\9845 69,29669,296 eee

5.30,011 CF fHz 22(50\(0,011\3,456 XfL 110 16,076 22(50\(198\ 53,4566,07834,65

Q6— Section header —

6.1.111 22 142250 34,0834 turns (2\

6.1.24,44 2504,44(50\(142\ 0,00793 EfN 0,00793(0,04\ 0,198(/\ BA BTWbm (4\

6.1.30,8 PkW Cos 5000(60\(0,8\ 104,167 PVICos (2\

6.23000,3 ImAA 0,37522,5 mmm VIRxv 6022,5 37,5 Tmse VVV

6.3Control circuits are more reliable Supply (AC\ is always available AC motors are smaller and lighter Pollution In order not to affect the communities around those stations

Mark Allocation

Sections10 + 18 + 18 + 18 + 18 + 18 = 100 marks

Key Information

Contact Number004 001 2002

Paper information

TitleMemo

SubjectElectrotechnics

LevelN4

Document typeNated Engineering

Year2018

MonthAugust

Pages8

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,992

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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File size263.3 KB

Pages8

Archived on8 September 2026

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