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What does the venturi in carburetor cause?

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What does the venturi in carburetor cause?

(a) Increase of air velocity

(b) A decrease in air velocity

(c) A decrease in fuel flow

(d) Decrease of manifold vacuum

I got this question in class test.

I would like to ask this question from Petrol Engine Fuel System in division Fuel Supply System of Automobile Engineering

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Right answer is (a) Increase of air velocity

For explanation: The venturi in carburetor causes an increase in air velocity. The main function of the carburetor are to keep a reserve of fuel at a constant head.

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