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

Supply electricity to the vehicle's electrical system at all times while the engine is running
Supply electricity to the alternator
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 main function of a master cylinder is to

Boost the force applied to brake pedal
Adjust the extent of brake pedal free play
Convert brake pedal force into hydraulic pressure
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure

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