Automobile Engineering in ME
The function of oil control rings is that it

Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Maintains a seal and prevents escape of burned gases and oil leakage
Lubricates the cylinder wall by releasing oil from its hole

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the alternator
Act as a reservoir or stabilizer of electricity
Supply a large amount of power to turn the starter motor when the engine is being started
Supply electricity to the vehicle's electrical system at all times while the engine is running

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Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a higher boiling point than DOT 3 fluid

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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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