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

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

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Automobile Engineering in ME
The advantage of having a tandem master cylinder arrangement in automobiles is that it

Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
Enhances safety by serving two independent lines in a divided line brake circuit
Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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