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Which of the following controls the position of the butterfly valve in the venturi unit?

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in Automotive Engine Design by (137k points)
Which of the following controls the position of the butterfly valve in the venturi unit?

(a) Motor

(b) Spring

(c) Accelerator pedal

(d) Adjusting screw

I got this question in a national level competition.

Question is from Diesel Engine Fuel Supply System topic in portion Diesel Engine Fuel Supply System of Automotive Engine Design

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The correct answer is (c) Accelerator pedal

To elaborate: Accelerator pedal controls the position of the butterfly valve in the venturi unit and hence the amount of vacuum from the inlet manifold,which is applied to the diaphragm via the vacuum pipe. As the diaphragm is connected to the fuel pump control rack.

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