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What is the purpose of the venturi in the carburetor?

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What is the purpose of the venturi in the carburetor?

(a) To decrease the fuel flow

(b) To increase the manifold vacuum

(c) To increase the air velocity

(d) To decrease the air velocity

I had been asked this question in an interview for internship.

This interesting question is from Carburettors topic in chapter Fuel Supply System of Automobile Engineering

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Correct choice is (d) To decrease the air velocity

Easy explanation: The purpose of the venturi in the carburetor is to increase the air velocity. The venturi in carburetors is used to measure airflow in an engine.

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