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

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

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Automobile Engineering in ME
In a ventilated disc brake

Disc contains many small holes for optimum cooling performance
Caliper is covered with cooling fins
A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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