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What is the main function of a throttle valve?

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What is the main function of a throttle valve?

(a) Temperature

(b) Air-fuel

(c) Enthalpy

(d) Entropy

I had been asked this question in an interview.

This interesting question is from Petrol Engine Fuel Supply System in section Petrol Engine Fuel Supply System of Automotive Engine Design

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Correct choice is (b) Air-fuel

To explain: The purpose of a throttle valve is to control the quantity of the air-fuel mixture and it is attached to the accelerator pedal. Whereas there is no such great effect of the throttle valve in the factors like temperature, enthalpy, and entropy.

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