Automobile Engineering in ME
The sequence order of events in a four stroke engine is

Suction exhaust power compression
Suction compression power exhaust
Suction power compression exhaust
Exhaust compression power suction

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Delivers improved cornering on dry road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces

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