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Which among the following is not an indication of the extra weak mixture?

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in Automotive Engine Design by (137k points)
Which among the following is not an indication of the extra weak mixture?

(a) Loss of power

(b) Overheating of engine

(c) Stalling of the engine

(d) Surging while idling

I got this question during an interview.

The question is from Petrol Engine Fuel Supply System in portion Petrol Engine Fuel Supply System of Automotive Engine Design

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Correct choice is (d) Surging while idling

The best I can explain: The extra weak mixture is recognized by flat spot while accelerating, stalling of the engine, loud popping in the carburetor, overheating of the engine and loss of the power. Whereas the surging while idling is due to extra rich mixture.

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