Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of sliding resistance
Can deal with movement of the suspension both vertically and in other directions
Improve the force transmission speed
Reduce the amount of noise generated

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