Automobile Engineering in ME
The main function of a master cylinder is to

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

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion
Ignition of the charge before the passage of flame front
Ignition induced by the passage of a spark
Automatic ignition of the charge at the end of compression

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