Automobile Engineering in ME
The rolling resistance is because of the friction between the

Wheel rim and road surface
Wheel rim and tyre
Tyre and the road surface
None of the listed here

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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

Makes the steering more responsive
Allows the steering wheel to be turned by a greater amount when steering
Reduces the amount of kickback for large steering angles
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

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

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