Auto Electrical Works Paper 2, WASSCE (SC), 2019

Question 5

 

Fig. 3 is the circuit diagram of a lighting system of a motor vehicle.                                    
            question
           

  1. 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.

  2.            
                             Table 4

     

    Conditions of switches

    S1

    H1

    H2

    S2

    R2

    N

    R2

    (i)

    Sw1 open, Sw2 open

     

     

     

     

     

     

     

    (ii)

    Sw1closed, Sw2 open

     

     

     

     

     

     

     

    (iii)

    Sw1 open, Sw2closed

     

     

     

     

     

     

     

    (iv)

    Sw1closed, Sw2closed

     

     

     

     

     

     

     


     

  3. State the type of connection between lamps H1 and H2

 

Observation

 

  1.      Table 4

  2.  

    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


     
  3. Parallel connection 
                                                                                

    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.