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

Question 3

Question 3
Remove the filler caps from the battery cells and do the following:
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.

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Observation

(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.