Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Compensate for wear in the steering linkage
Bring the road contact of the tyre under the point of load
Maintain directional control
Prevent uneven tyre wear

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

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
Removes impurities from cylinder head lubricating oil

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

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