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

Maintains a seal and prevents escape of burned gases and oil leakage
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
Lubricates the cylinder wall by releasing oil from its hole

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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the rear tyres
Extreme length of the vehicle
Distance between the centres of the front and rear wheels
Distance between the centres of the front tyres

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The crests between the tread grooves absorb road noise
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure sulphuric acid
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is pure distilled water

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