Motor Electrical Theory N1 — Document
April 2020 — N1 — Motor Electrical Theory
N1
2020
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.
1.1.1
1.1.2
1.1.3Which ONE of the following circuits maintains the battery voltage in a motor vehicle Engine management circuit Charging circuit Ignition ci rcuit
1.1.4omponent used to turn the ignition: Battery Ignition coil Ignition distributor Ignition switch
1.1.5esistor allow ing the highest current flow: 1 ohm 100 ohm 10 ohm
1.1.6nsulating material: Steel Brass Copper Bakelite
1.1.7omponent ignit ing the fuel mixture in a petrol engine: Ignition distributor Ballast resistor Ignition coil Spark plug
1.1.8oltage of fully charged battery: 12,6 13,2
1.1.9atest technology in vehicle lighting systems Incandescent Halogen LED Xenon
1.1.10dditional lights enhanc ing the headli ghts with long range visibility Driving lights Auxiliary lights Fog lights Park lights
1.2Indicate whether the following s tatements are TRUE or FALSE by writing only 'True' or 'False' ne xt to the question number (1.2.1
1.2.10\ in the ANSWER BOOK.
1.2.1Stop lights indicate that the driver intends to stop.
1.2.2The fuel gauge indicates how much fuel left in the tank.
1.2.3LED globes consume more power than conventional globes.
1.2.4In most modern cars the intermittent wiper action is not adjustable.
1.2.5Ammeters measure resistance in an electrical circuit.
1.2.6All cars are designed to use negative earth.
1.2The transistor can be used as a solid state amplifier.
1.2Doping is used to influence the electrical characteristics of a material.
1.2In a DC circuit conventional current flows from positive to negative.
1.220
Q2— Section header —
2.1Three resistors 5 ohm, 18 ohm and 10 ohm respectively are connected in series to a 12 V battery Sketch the circuit
1.3Calculate the current flowing through V battery.
2.2Define Ohm' s law. (2\
2.3hat modification can be to decrease the current in the circuit in
Q2— Section header —
2.4The globe of a headlight is rated at 12V/100W.
4.1Determine the current flowing through this globe Cal culate the resistance offered by the globe. (2 [17]17
Q3— Section header —
3.1xplain how high voltage spark is generated in V ignition coil.
3.2Which TWO factors determine the exact ignition timing point (2\
3.3The engine of an old 1975 model car still us ing contact breaker points pinking on acceleratio Explain step by step how the timing must be reset
3.4Name the latest development in spark ignition systems [16]16
Q4— Section header —
4.1A motor car which only starts when a booster battery is used needs a high rate discharge test. Explain how this test is done.
4.2Construct a complete headlight circuit with high and low beams. Include a battery, fuses and rel ays for both high and low beam circuits. No internal detail of relays is required.
4.3Name the FOUR main external lighting circuits used on motor vehicles. [17]17
Q5— Section header —
5.1Explain, w ith the aid of a graph, the operation o f the thermistor which control temperature gauge. (6\
5.2Construct a simple oil pressure warning lamp circuit. Internal d etails of the pressure switch ar not required List FOUR reasons why a hooter may fail. Name TWO types of flasher units. [17]17
Q6— Section header —
6.1Define semi conductors.
6.2ndicate the difference between NPN and PNP transistors with the aid of sketches.
6.3Name the TWO most common materials used in the manufacture of semi conductors.
6.4What does the acronym LED mean [13] TOTAL13
Topics Identified
1
Leadership
Mark Allocation
Total100 marks
Sections20 + 17 + 16 + 17 + 17 + 13 = 100 marks
Paper information
TitleDocument
SubjectMotor Electrical Theory
LevelN1
Document typeQuestion paper
Year2020
MonthApril
Pages7
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
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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