The electrolyte used in a nickel-cadmium battery is distilled water and what other substance?

Correct Answer: Option B — potassium hydroxide

Nickel-cadmium (Ni-Cad) storage batteries utilize an alkaline electrolyte solution composed of potassium hydroxide dissolved in distilled water, unlike lead-acid batteries which use acidic solutions. 46 CFR Subchapter J and IEEE 45 regulate the installation, ventilation, and maintenance of alkaline battery systems aboard merchant vessels.