Engine : Electricity - 713/1386
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| What is the most reliable and preferred method for determining the state of charge of a wet-cell NiCad battery? |
| A) Measuring the specific gravity of each cell with a hydrometer. |
| B) Measuring the battery voltage with a digital voltmeter during charge or discharge. |
| C) Measuring the battery voltage with a solenoid type voltage tester during charge or discharge. |
| D) Measuring the temperature-corrected specific gravity of each cell with a hydrometer and thermometer. |
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