Automobile Engineering in ME
The path taken by intake air is

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

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke
Leaving the T.D.C. position on its compression stroke

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