Automobile Engineering in ME
The rigid suspension is beneficial when

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

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

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Approaching the T.D.C position on its exhaust stroke
Leaving the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke

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