Automobile Engineering in ME
The aluminium alloy is used in cylinder blocks because

Material cost is low
It is lighter and has good heat dissipation characteristics
The piston is also made of aluminium alloy
It does not require any cylinder liners

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Automobile Engineering in ME
In a ventilated disc brake

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
Disc contains many small holes for optimum cooling performance
Caliper is covered with cooling fins

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