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Diesel engine can work on very lean air fuel ratio of the order of 30:1. A petrol engine can also work on such a lean ratio provided?

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Diesel engine can work on very lean air fuel ratio of the order of 30:1. A petrol engine can also work on such a lean ratio provided?

(a) it is properly designed

(b) best quality fuel is used

(c) can not work as it is impossible

(d) flywheel size is proper

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

This is a very interesting question from Fuel Air Cycle in portion Fuel Air and Actual Cycles and their Analysis of IC Engine

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Right choice is (c) can not work as it is impossible

For explanation: Petrol engine cannot work below air fuel ratio 20:1.

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