Automobile Engineering in ME
The power source for a brake booster is

The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
Electricity
Exhaust manifold pressure
Hydraulic pump

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of sliding resistance
Reduce the amount of noise generated
Improve the force transmission speed
Can deal with movement of the suspension both vertically and in other directions

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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
Automatic ignition of the charge at the end of compression
Ignition induced by the passage of a spark

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