Automobile Engineering in ME
The function of an alternator in an automobile is to

Converts mechanical energy into electrical energy
Supply electric power
Partly converts engine power into electric power
Continually recharges the battery

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Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 4 fluids have a lower boiling point than DOT 3 fluid

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Automobile Engineering in ME
The basic function of the suspension is to

Ensure that wheel alignment is not disturbed during driving
Absorbs vibration and impact forces from the road surface
Automatically correct the effects of over steering
Ensure that the steering wheel can deliver a suitable amount of steering force

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