Electrotechnics N4 — Memo P2

August 2021 — N4 — Electrotechnics

N4 2021 Nated Engineering

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Q1— Section header —

1.1.10x 1\ (10\

1.2

1.3.2

1.4.1Consider Loop 1: 11133 VIRIR 101040 112 101040(\ III 105040.................................. (1\

1.4.2Substitute I into (1\ 105040 10[50(0,143\40 0,429 (2\

1.4.3312 0,1430,4290,286 III (2\ [30]30

Q2— Section header —

2.1Given: p = 4 = 2 x 4 = 8 N = 450 r/p E = 250 V = 0,05 Wb ZNp 602508 245040,05

2.2.1

2.2.2Given: = 0,2 I = 40 A se = 0,133 V = 480 V sh = 120 40436

2.3Given: start = ?, I start = 1,5I V = 400 V, R = 0,35 P = 12 kW, I = P/V = 12

Q3— Section header —

3.1647,21133,69 424,47226,55 10210,19811,31 ZZZ 19,6111,31 10,198 19

3.2.2Power factor = Cos = 0,98 lagging (19,6111,31\(7,21133,69\ 141,422,38 VIZ VIZ (19,6111,31\(4,47226,55\ 87,69637,86 VIZ

3.2.4Correct phasor diagram = 1 Any correct angle (1 1\ = 1 Any TWO correct values (2 1\ = 2 (4\

3.3Given: P = ? I = 10 A V = 250 V Cos = 0,8 f = 50 Hz P = VI Cos = (250\(10\(0,8\ = 1,44 [20]20

Q4— Section header —

4.1No hysteresis losses No flux leakage No distortion 100% efficiency (5\

4.2Data: 22 4,4 SkVA fHz VEV VEV 48440 VN

4.2.24400440 VAIV 4400120 36,67 VAIV IA (2\

4.2.34,44 EfN 4,44 EfN 120(4,44\(\(50\(48\ 0,0112611,26 WbmWb (2\ [10]10

Q5— Section header —

5.1.2Poles = 2 pole pairs 2 = 4 poles the centrifugal switch disconnects the starting winding from the supply (2\

5.4Capacitor start split phase motors are used where the starting load is high. refrigerators automatic washing machines compressors pumps

Q6— Section header —

6.1Power station Transmission ines Substation Step down ransformer (mark may also

6.2Wattmeter (1\

6.4Given: = 45 = 100 = 10 (2\ [10] TOTAL:10

Topics Identified

Business Plan

Mark Allocation

Sections30 + 20 + 20 + 10 + 10 + 10 = 100 marks

Key Information

Contact Number040 112 1010 · 040 212 2020

Paper information

TitleMemo

SubjectElectrotechnics

LevelN4

Document typeNated Engineering

Year2021

MonthAugust

Pages8

Downloads3

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

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 size371 KB

Pages8

Archived on8 September 2026

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