Automobile Engineering in ME
The main function of a resonator is that it

Reduces the intake air noise
Enhances intake efficiency
Regulates the intake air flow rate
Regulates the intake air temperature

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Automobile Engineering in ME
In a ventilated disc brake

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

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