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

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

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

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