Motor Electrical Theory N1 — Document
August 2019 — N1 — Motor Electrical Theory
N1
2019
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 ANSWWER BOOK.
1.1.1The staring circuit ensures high amperage current to the coil to produce the high tension spark starter to crank the engine alternator during cranking headlight circuit during cranking
1.1An ion is an atom that has an electrical charge a neutral charge nucleus is that is positive nucleus is that is negative
1.1The function of the fuse in circuit is to increase circuit current decrease circuit current protect the circuit insulate the circuit
1.1
1.1How many coil s are combined in a coil pack used i n a 4 cylinder engine?
1.1The specific gravity of a fully charged battery is
1.1The latest design in headlight bulb technology is the bulb halogen incandescent twin filament gas discharge
1.1The standard wattage of park ing light circuits is
1.1ost electronic sensors are rated
1.1When diffusing P and N type material it forms a diode. The barrier area form between the TWO materials is known as the zone
1.2Indicate whethe r the following statements are TRUE or FALSE Choose the answer and write only 'True' or 'False' next to the question number (1.2.1
1.2.10\ in the ANSWER BOOK.
1.2.1Electric current is the flow of electrons across conductors.
1.2.2opper offers the least resistance all metals to current flow.
1.2.3A transistor is a combination of three or more diodes.
1.2.4Strong electromagnets can attract even nonferrous metals.
1.2.5Good auto electrician diagnoses and repairs electrical circuits by the trial and error method.
1.2.6It is always advisable to fit a higher amperage fuse if the designated fuse continuously blows.
1.2.7To sense the fuel level in the tank a rheostat is connected to the float.
1.2.8The abbreviation TPMS stands for tyre pressure monitoring system.
1.2.9The elect rolyte of the conventional lead/ acid battery is a mixture of water and sulphur.
1.2.1020
Q2— Section header —
2.1A 24 V starter draws a current of 80 A during cranking. Calculate the resistance offered by the starter.
2.2Draw the following electrical symbols
2.2Diode
2.2Bulb
2.2Transistor
2.2Switch
2.2Fuse
2.2Relay
2.2Motor
2.2Battery
2.2Galvanometer
2.2.10 Zener diode (10 (10\
2.3A park ing light circuit consists of 2 bulbs of 5 W each. The globes are connected through a switch to a 12 V battery.
2.3Draw the circuit (3\
2.3.2Calculate the total current of the circuit (5\ [20]20
Q3— Section header —
3.1Explain the function and operation of the mechanical advance unit. (9\
3.2Why it is important that the ignition timing be advanced according to engine load? (4\
3.3List THREE functions of a spark plug. (3\
3.4Draw a fully labelled sketch of a bar magnet, showing the poles and magnetic lines and their direction. (4\ [20]20
Q4— Section header —
4.1All car batteri es have a label indicating the amp hour (A.h.\ rating of the battery. Briefly explain what a 45 h specification mean (3\
4.2ifferen tiate between a gel cell and a conventional lead/ acid cell (2\
4.3How can corrosion be removed from a battery terminal clamp? (1\
4.4List FOUR lighting circuits in modern vehicles. (4\ [10]10
Q5— Section header —
5.1State FOUR possible reasons why a heat gauge does not work (4\
5.2Make a neat , labelled sketch of a diaphragm type electric fuel pump. Only sketch the electrical se ction of the pump. (5\
5.3Which motorcar accessory is use to warn pedestrians of your presence? (1\ [10]10
Q6— Section header —
6.1Explain the operation of a PN junction in reverse bias (5\
6.2Explain the operation of a diode connected in reverse bias. Pay special attention to the depletion zone. (3\
6.3Make a neat labelled sketch of a NPN transistor. (3\
6.4Sketch the characteristic curve of a transistor used as a switch. (5\
6.5Show, by means of a diagram, how a diode is connected in forward and in reverse bias. (4\ [20] TOTAL:20
Mark Allocation
Total100 marks
Sections20 + 20 + 20 + 10 + 10 + 20 = 100 marks
Paper information
TitleDocument
SubjectMotor Electrical Theory
LevelN1
Document typeQuestion paper
Year2019
MonthAugust
Pages8
Downloads3
Examination context
Decade2010s
Years ago7y
SeasonWinter (SH)
Start dayThursday
Exam periodAugust 2019
Days since exam2,629
About Motor Electrical Theory examination preparation
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