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

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

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

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