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Auto Electrical Works Paper 3, May/June 2014  
Questions: 1 2 3   Main
General Comments
Weakness/Remedies
Strength















Question 3

Question 3
Remove the filler caps from the battery cells and do the following:
(a)  copy Table 1 into your answer booklet;
                                                                        Table 1
           


Cell

1

2

3

4

5

6

Specific gravity

 

 

 

 

 

 

Temperature (0C)

 

 

 

 

 

 

Condition of cell

 

 

 

 

 

 

 

(b)  squeeze the hydrometer bulb and insert the pick-up tube into the cell closest to the
       positive terminal of the battery (cell 1);   
(c)  slowly release the bulb to draw in electrolyte to cause the rising of the float;
(d)  read and record in Table 1, the specific gravity and temperature of the cell;
(e)  repeat steps (b) to (d) for the remaining five cells (cells 2 to 6);
(f)  using the readings obtained in Table 1, determine the state of charge of each cell.
            NOTE:            (i)         Write good if ok.
                                    (ii)        Write bad if cell is damaged.

_____________________________________________________________________________________________________
Observation

The expected answers were:
(a)                                Table 1


Cell

1 - 6

1 – 6                   

Specific gravity

1.19 – 1.29

Below 1.19

Temperature (0C)

250C – 600C

Above 600C

Condition of  cell

Good

Bad

State of cell

Ok

Damaged

 

 

 


Note: The reading of the specific gravity of a particular cell determines the temperature, condition of cell and state of the cell.                                                        
As reported, the candidates of the only examination centre that attempted this question performed fairly well.

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