Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The unsprung mass in lighter
The vertical size of the suspension can be made more compact
The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering
Reduces the amount of kickback for large steering angles
Makes the steering more responsive

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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

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

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