Automobile Engineering in ME
Caster is a

Forward tilt of the kingpin OR Backward tilt of the kingpin
None of the listed here
Forward tilt of the kingpin
Backward tilt of the kingpin

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation
Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons

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