Question

The battery cannot be sealed because ____________

(a) they emit noxious gases

(b) they emit hydrogen

(c) to be exposed to air

(d) to have the ventilation

I have been asked this question during an online exam.

I want to ask this question from Engine Starting Methods in section Diesel Engine Plant of Energy Engineering

Answer 1

Right choice is (c) to be exposed to air

The explanation is: Because batteries emit hydrogen gas while charging, the battery case cannot be completely sealed. Years ago there was a vent cap for each cell and we had to replenish the cells when the electrolyte evaporated. Today’s batteries (maintenance free) have small vents on the side of the battery; the gases emitted have to go through baffles to escape.