Motor Electrical Theory N1 — Document
April 2021 — N1 — Motor Electrical Theory
N1
2021
Nated Engineering
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Q1— Section header —
1.1Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question number (1.1.1
1.1.10\in the ANSWER BOOK.
1.1.1The electrical circuit responsible for managing the fuel mixture is the circuit auxiliary
1.1.2Electrical pressure is measured in amperes volts
1.1.3This material is a conductor of electricity: Bakelite Iron Porcelain Glass
1.1.4Fleming's right hand rule applies t coils
1.1.5The ignition circuit is responsible for turning on the ignition lights igniting t he fuel
1.1.6In electronic ignition systems, the pri mary current is switched on by electronic pulse generator resistor
1.1.7The ideal batter 50% water and 50% acid 30% acid and 70% water. 40% acid and 60% water
1.1.8globe s have the longest life span compare d to other glo bes used for headlights.
1.1.9The following symbol indicates a faulty alternator:
1.1.10The followin symbol represents a fuse in an electrical circuit:
1.2Indicate whether the following statements are TRUE or FA LSE by writing only 'True' or 'False' next to the question number (1.2.1
1.2.10\in the ANSWER BOOK.
1.2.1The flow of electricity through a circuit can be compared to water flowing through pipes.
1.2.2EMF is the voltage of the battery when no t connected in circuit.
1.2.3Soft iron cores in solenoids improve the magnetic flux.
1.2.4An ignition coil is a step up transformer.
1.2.5Most cars have positive earth.
1.2.6Maintenance free b atteries do not have to be load test ed to determine their condition.
1.2.7Levelling the head lights means to adjust the lights according to tyre size.
1.2.8The Bourdon tube can also be used in the manufacturing of electronic pressure gauges.
1.2.9The Zener diode allows curre nt to flow even in reverse bias.
1.2.10A transistor consists of three PN junctions. (10 1\ (10\ [20]20
Q2— Section header —
2.1Make a neat ketch of the circuit (3\
2.2Calculate the total resistance in the cir cuit. (3\
2.3Calculate the total current in the circuit. (1\
2.4Determine the current flow through each resistor. (8\
2.5Determine the power consumption of the 5 ohm resistor. (1\ [16] 1104060116
Q3— Section header —
3.1Explain the principle of mutual induction. (3\
3.2State the difference between a hot spark plug and a cold spark plug (2\
3.3Fully explain the ope ration of the conventional coil ignition system. (6\
3.4Name SIX components that for m part of the conventional coil ignition system. (6\ [17]17
Q4— Section header —
4.1Explain the function of a relay. (3\
4.2Your brother's old car has a starting problem. The starter only makes a click sound . You recommend the installation of a relay to remedy the problem.
4.2.1 Draw a neat, simple wiring diagram to show how relay should be install ed.
4.2.2 xplain why this will cure the problem. (3
4.3What is the function of a fuse in any electrical circuit? (1\
4.4Construct a brake light circuit tha t only works when the ignition is turned on. Include a main relay and one fuse. (6\
4.5State the most likely reason why direction indicators flash fast. (1\ [20]20
Q5— Section header —
5.1Draw a neat, fully labelled sketch of vibrating armature hoote r. (5\
5.2Explain the operating principle of the vibrating armature hooter. (7\ 5. Give the meaning of each of the warning symbols below.
5.3.3
5.3.4
5.3.5 (5 1\ (5\ [17] QUESTIO N 617
6.1Make TWO labelled sketches to show the difference between NPN and PNP transistors.
6.2Make TWO sketches to show how a diode can be connected in forward and reverse bias. [10]10
Mark Allocation
Total100 marks
Sections20 + 16 + 17 + 20 + 17 + 10 = 100 marks
Paper information
TitleDocument
SubjectMotor Electrical Theory
LevelN1
Document typeQuestion paper
Year2021
MonthApril
Pages7
Downloads3
Examination context
Decade2020s
Years ago5y
SeasonAutumn (SH)
Start dayThursday
Exam periodApril 2021
Days since exam2,021
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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