Question 1
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Question 1
(a) Describe briefly in five steps the preparation of a lead-acid battery electrolyte.
(b) List two types of test which a battery should pass in order to be considered worthy for use.
(c) Table 1 contains underived battery state of charge.
Complete the table by stating two symptoms and remedies for each of the listed conditions.
Table 1
S/NCondition
Symptom
Remedy
(i)
Overcharged battery
(ii)
Low state of charge
Observation
The expected responses were:
- Steps in the preparation of a lead acid battery electrolyte
- Measure acid and distilled water in the ratio of 1 : 3.
- Add acid to water gently in an acid-proof container
- Stir gently with a glass rod/wood
- Allow the mixture to cool
- Measure the specific gravity of the electrolyte and ensure it reads 1.28
- Types of battery test
- Voltage test: Voltmeter / Multimeter
- Specific gravity test: Hydrometer
- Load / Drain test: High rate discharge tester
- Digital multimeter testing
- Conductance test
- Load testing
- Pico diagnostic battery test
- Table 1
S/N |
Condition |
Symptoms |
Remedy |
(i) |
Overcharged battery |
|
|
(ii) |
Low state of charge |
|
|
As reported by the Chief Examiner, the performance of students in parts (a) and (b) of the question was average. However, in part (c), candidates’ performance was relatively below average.