49) The air - fuel ratio of the petrol engine is controlled by

Carburetor

Injector

Governor

None of these

Answer is:

Carburetor

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50) The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

Detonation

Turbulence

Pre - ignition

Supercharging

Answer is:

Detonation

Explanation:

Detonation: Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug.
Pre-ignition: Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing.