Automobile Engineering in ME
The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation
Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons
Adjusts the timing of the intake and exhaust valve openings

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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 compression 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 exhaust stroke

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