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

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

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

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

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