Motor Electrical Theory N2 — Document

December 2023 — N2 — Motor Electrical Theory

N2 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 46 items found

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Q1— Section header —

1.1Six cells, each with an emf of 1,2 V an d an internal resistance of 1,2 , are connected in ser ies with a resistance of 10 Calculate:

1.1.1The emf of the battery

1.1.2The current in the circuit

1.1.3The potential difference of the battery

1.1.4

1.2Three resistors are connected in parallel with a 48 V supply. The value of the resistors are 6 Calculate:

1.2.1The total resistance in the circuit (2\

1.2.2The total current (2\

1.2.3The current flowing through each resistor (6\

1.3Define each of the following

1.3.1Electromotive force

1.3.222

Q2— Section header —

2.1List FOUR specifications required to test a starter motor on a test bench. (4\

2.2State the function of the overrunning clutch inside a starter motor drive. (3\

2.3List FOUR charact ristics of a good brush lead in a starter motor (4\

2.4Explain the purpose of starter motor brushes and name TWO materials that are within the composition of the brushes. (3\

2.5Which type of DC motor is used for a starter motor? Explain why this type of motor is required. (2\ [16] 1104061216

Q3— Section header —

3.1Explain, step by step , how to set the dynamic ignition of an engine by using a stroboscopic timing light. (5\

3.2List FOUR components of a conventional oil filled coil ignition system. (4\

3.3Explain each of the following as it relates to coil ignition system:

3.3.1Static timing

3.3.2Dynamic timin

3.3.3

3.4Briefly explain how to test the primary and secondary windin gs of an ignition coil for open circuit fault. Name the instrument used to

Q4— Section header —

4.1Explain in detail how to test the armature of a generator for each of the following faults:

4.1.1Earth fault

4.1.2Open circuit fault

4.1.3

4.3Give TWO purpose of the commutator of a DC generator. (2\

4.4Give TWO sources of direct current (2\ [16] 1104061216

Q5— Section header —

5.1Explain the purpose of the rectifier in a battery charger. (2\

5.2Explain the procedure to test a lead acid battery for sulph ation (4\

5.3Explain the procedur e for fast charging a lead acid battery. (4\

5.4List THREE factors that may lead to a sulphated lead acid battery. (3\ [13]13

Q6— Section header —

6.1Draw a graph that represents the characteristics of a silicon diode. Indicate the conducting voltage, forward and reverse characteristics and breakdown point. (5\

6.2State the forward conducting voltages of each of the following components:

6.2.1Silicon diode

6.2.2

6.3Explain the purpose of a transformer. (2\

6.4What is the purpose of a diode in a circuit (2\ [13] TOTAL: 10 1104061213

Mark Allocation

Total100 marks

Sections22 + 16 + 20 + 16 + 13 + 13 = 100 marks

Paper information

TitleDocument

SubjectMotor Electrical Theory

LevelN2

Document typeQuestion paper

Year2023

MonthDecember

Pages6

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSummer (SH)

Start dayFriday

Exam periodDecember 2023

Days since exam1,045

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

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 size406 KB

Pages6

Archived on8 September 2026

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