Automobile Engineering in ME
A three way catalytic converter

Reduces N₂, H₂O, and CO₂ emission levels
Re-circulates exhaust gases
Burns fuel vapour gases
Removes CO, HC, and NO₂ from the exhaust gases passing through it

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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

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

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

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

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