Question 542Electricity & Electronics - Assistant Engineer

The correct answer is D. The specific gravity of the electrolyte in a lead-acid battery will increase as the water evaporates from the electrolyte solution, leaving a higher concentration of sulfuric acid. This is because the sulfuric acid is the primary component that contributes to the specific gravity of the electrolyte. As the water evaporates, the relative concentration of the sulfuric acid increases, causing the specific gravity to rise. The other options are incorrect because: A) there is a predictable tendency for the specific gravity to increase, B) the sulfuric acid does not selectively evaporate, and C) both the water and sulfuric acid will evaporate, leading to an increase in specific gravity.