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
The major purpose of an electronically controlled automatic transmission is that this type of transmission

Reduces shift shock and achieves more efficient transmission of engine torque
Eliminates gear clutches
Reduces the number of automatic transmission components
Eliminates the gear shaft lever

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