Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Removes impurities from cylinder head lubricating oil
None of these
Prevent engine oil from going into combustion chamber
Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head

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Automobile Engineering in ME
The function of a second ring is that it is a

Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Back up compression ring which will work in place of the top ring when it is broken
Cushion ring which prevents piston slap and knock

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Automobile Engineering in ME
The main function of a master cylinder is to

Boost the force applied to brake pedal
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Convert brake pedal force into hydraulic pressure
Adjust the extent of brake pedal free play

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