Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to have more flexibility in design
It is desired to improve tyre to ground contact characteristics
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke

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Automobile Engineering in ME
In a ventilated disc brake

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

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Maintains a seal and prevents the fuel leakage
Increases the combustion temperature
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Creates swirl

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