Automobile Engineering in ME
The most effective method of controlling S.I. engine exhaust emission is by

None of these
Recirculating exhaust
Using catalytic converter
Using some additives in the fuel

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

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

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