Automobile Engineering in ME
The battery is an electrochemical device, which means battery

Does not use an electrolyte
Has curved plates instead of flat plates
Uses chemical action to provide electricity
Makes chemicals by mechanical means

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Overcooling of the brakes during high speed driving
Keeping the vehicle without use for an extended period
An excessively high engine speed on a downhill road
Overheating of the fluid due to frequent brake application

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