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

Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
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

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It makes petrol engines lighter
Less compression ratio gives better performance
It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

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