Motor Electrical Theory N2 — Document

April 2020 — N2 — Motor Electrical Theory

N2 2020 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 34 items found

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Questions — A Preview of What to Expect in the Document

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Q1— Section header —

1.1A motor vehicle has two 24 V batteries connected in series. The combined EMF of both batteries is 48 V. A load drawing 8 amperes is connected to the supply. The internal resistance of the supply is 0,24

1.1.1The EMF per battery (2\

1.1.2The potential diffe rence of the supply at the load (2\

1.1.3The internal resistance per battery (2\

1.1.4he internal resistance per cell (2\

1.2Make a neat ketch of the circuit

Q1— Section header —

Q2— Section header —

2.1Make a fully labelled sketch and e xplain how self induction occurs in a circuit. (7\

2.2A single conductor of a generator armature is 150 mm long. The conductor moves at right angles through a magnetic field with a flux density of 0,25 tesla at a speed of 70 kilometres per hour. Calculate the

2.3State THREE practical applications of electromagnetic induction. (3\

2.4State FOUR advantages of electromagnetic induction. (4\ [18]18

Q3— Section header —

3.1Fully d escribe the construction of a solenoid of a pre engaged type starter motor

3.2State TW O necessary characteristics of the brush lead of a starter motor. (2\

3.3State TWO possible causes of burnt wind ings in a starter motor armature. (2\

3.4State FOUR components of a starter motor armature. (4\

3.5Fully d escribe the construction of the field coils of a starter motor. (4\

3.6Explain the procedure to test the armature for the followi

3.6.1Earth fault

3.6.2Open circuit in windings

3.6.321

Q4— Section header —

4.1Explain the relation between the points gap the dwell angle and the ignition timing

4.2State TWO advantages of a magneto system when compared to the conventional ignition system (2\

4.3Make a neat, labelled sketch of a stroboscopic timing light. (4\

4.4Explain how the breaker point gap of the ignition system is corrected by using a dwell meter. (4\

4.5State THREE current uses of magnetos. (3\

4.6State FOUR specifications that are required before setting the ignition timing with timing light. (4\ [20] QUESTION raw a neat labelled circuit diagram of a full20

5.2Explain the procedure to test a lead acid battery to determine if the cells are sulphated. (4\

Q6— Section header —

6.4Fully exp lain the process of doping semi conductor materials. (4\

6.5Make a neat, labelled sketch showing the forward and reverse characteristics of a silicon diode. (4\ 13] TOTAL:

Mark Allocation

Total100 marks

Sections16 + 18 + 21 + 20 = 75 marks

Paper information

TitleDocument

SubjectMotor Electrical Theory

LevelN2

Document typeQuestion paper

Year2020

MonthApril

Pages5

Downloads3

Examination context

Decade2020s

Years ago6y

SeasonAutumn (SH)

Start dayWednesday

Exam periodApril 2020

Days since exam2,383

About Motor Electrical Theory 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

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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.

File details

File size218 KB

Pages5

Archived on8 September 2026

File age46d

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