Question 5
Fig. 3 is the circuit diagram of a lighting system of a motor vehicle.
- Study Fig. 3 and use it to complete Table 4 appropriately with either ON or OFF for the
given conditions of switches Sw1 and Sw2. - State the type of connection between lamps H1 and H2
Table 4
|
Conditions of switches |
S1 |
H1 |
H2 |
S2 |
R2 |
N |
R2 |
(i) |
Sw1 open, Sw2 open |
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(ii) |
Sw1closed, Sw2 open |
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(iii) |
Sw1 open, Sw2closed |
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(iv) |
Sw1closed, Sw2closed |
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Observation
|
Condition of switches |
S1 |
H1 |
H2 |
S2 |
R1 |
N |
R2 |
(i) |
Sw1 open, Sw2 open |
OFF |
OFF |
OFF |
OFF |
OFF |
OFF |
OFF |
(ii) |
Sw1 closed, Sw2 open |
ON |
OFF |
OFF |
ON |
ON |
ON |
ON |
(iii) |
Sw1 open, Sw2 closed |
OFF |
ON |
ON |
OFF |
OFF |
OFF |
OFF |
(iv) |
Sw1 closed, Sw2 closed |
ON |
ON |
ON |
ON |
ON |
ON |
ON |
It was reported that majority of the candidates that attempted question 5 showed basic understanding of the lighting system as their responses were averagely good.