Q. The air-fuel ratio of a petrol engine is controlled by

A
Injector
B
Governor
C
Carburator
D
Fuel pump
Solution:

In a conventional petrol engine, the air-fuel ratio is controlled by the carburettor.

The process of mixing air and fuel is called carburation. the device which does the process is called carburettor.
Typical values of air fuel mixture

Stoichiometric air mixture 14.7 :1

Lean air mixture 8:1 to 12:1

Rich air mixture 16:1 to 20 :1

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