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 ventilationI 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

The battery cannot be sealed because ____________(a) they emit noxious

1.	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 ventilationI 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» 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.

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