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

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
None of these

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering
Reduces the amount of kickback for large steering angles
Makes the steering more responsive

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