Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Creates swirl
Increases the combustion temperature

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the alternator
Supply electricity to the vehicle's electrical system at all times while the engine is running
Act as a reservoir or stabilizer of electricity
Supply a large amount of power to turn the starter motor when the engine is being started

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

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

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