Spent lead-acid batteries must be:

What fluid should be used to refill battery cells with low electrolyte levels?

The “84 factor” allows estimation of cell voltage based on specific gravity.

A hydrometer measures:

Baking soda can neutralize spilled electrolyte.

Typical piezoelectric injector operation allows up to how many separate injection events per cycle?

Electrohydraulic injectors are purely mechanical devices.

Which of the following is true regarding pintle nozzles?

The fuel droplet size decreases as injection pressure increases.

Piezoelectric injectors use _______ to control fuel delivery.