Question 65Electricity & Electronics - QMED
70% to passWhen troubleshooting a lead-acid storage battery, what is the best method for detecting a weak or dead cell?
Acomparing the specific gravity of the electrolyte in each cell
Btaking each cell's temperature with a calibrated mercury thermometer
Cvisually inspecting the electrolyte levels of each cell
Dtaking an open circuit voltage test of individual cells
AI Explanation
The correct answer is A) comparing the specific gravity of the electrolyte in each cell. The specific gravity of the electrolyte in each cell of a lead-acid storage battery is the best method for detecting a weak or dead cell. This is because the specific gravity directly corresponds to the state of charge of the cell - a lower specific gravity indicates a weaker or discharged cell. Visually inspecting the electrolyte levels (C) or taking an open circuit voltage test (D) do not provide as reliable an indication of cell health as the specific gravity measurement. Taking each cell's temperature (B) is not the primary method for detecting a weak cell.
Related Questions
Q129:In a short-shunt cumulatively compound-wound DC motor, how is the shunt field co... Q417:When a fluorescent lamp has reached the end of its useful life, it should be rep... Q178:What is the purpose of a ship's service generator circuit breakers reverse power... Q120:Which of the listed colors properly describes a DC motor commutator when correct... Q501:When the operating handle of a molded-case circuit breaker is in the mid-positio...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources