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Question 3
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Question 3
(a) State three faults that could cause the ignition warning light not to show when the ignition is in the ON position.
(b) State three effects of a very large dwell angle.
(c) State three factors that affect the ignition timing of a motor vehicle.
The expected answers were:
(a) Any three faults
Burnt or loose bulb
Flat battery
Short circuit in ignition system
Open circuit
(b) Too large dwell angle will result in
(i) over saturation of the coil winding at low speed;
(ii) overloading of condenser;
(iii) burning of the points if the contact breaker;
(iv) weaker spark;
(v) hard starting;
(vi) loss of power.
(c) Any three factors
Engine speed
Intake air volume
Shape of the combustion chamber
Inside temperature of the chamber
Compression ratio
The question was on Ignition System. It was unpopular with the candidates in spite of the
inadequacy in Question 3(a). The candidates’ performance was reported to be average. |
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