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

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

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Absorb any difference in speed between the left and right wheels when the vehicle is turning
None of these
Absorb the vibrations transferred from the surface of the road
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

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Automobile Engineering in ME
Incorrect steering axis inclination (S.A.I.) causes

The vehicle to pull to the side of lesser inclination
Poor recovery of the steering wheel after making a turn
Generation of a braking effect at tight corners
Tendency to assume toe-out orientation

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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms
The vertical size of the suspension can be made more compact
The unsprung mass in lighter

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