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

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

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Supplies a large amount of fuel and thereby creates a choke effect
Warm up and lubricate the pump
Pressurise the fuel system before the engine is started
Enable the pump's fault diagnosis function to operate

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